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Abstract

This study investigates neighborhood scale net migration of young adults in the top twenty urbanized areas (UAs) in the U.S. between 1980 and 2010. Both descriptive and regression analyses show that Generation Xers and Millennials were more likely to net migrate into central locations and less aversive to high density at their young ages than late boomers were in the 1980s. Consumption amenities are a critical factor that distinguishes the net migration patterns between young and old adult groups, and became a more important location factor for young adults in the 2000s (late Gen Xers and older Millennials) than in the 1990s (early Gen Xers). There exists a considerable degree of heterogeneity across UAs and neighborhoods even within the same UAs. This article is protected by copyright. All rights reserved.
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Yongsung Lee ORCID iD: 0000-0002-1980-1225
Urban Revival by Millennials? Intra-Urban Net Migration Patterns
of Young Adults, 19802010
Yongsung Lee
Georgia Institute of Technology
Bumsoo Lee
University of Illinois at Urbana–Champaign
Md Tanvir Hossain Shubho
University of Illinois at Urbana–Champaign
Contact author: Yongsung Lee, School of Civil and Environmental Engineering, Georgia
Institute of Technology, 790 Atlantic Drive, Atlanta, GA 30332. Email:
yongsung.lee@gatech.edu
Abstract
This study investigates neighborhood scale net migration of young adults in the top
twenty urbanized areas (UAs) in the U.S. between 1980 and 2010. Both descriptive and
regression analyses show that Generation Xers and Millennials were more likely to net
This article has been accepted for publication and undergone full peer review but has not
been through the copyediting, typesetting, pagination and proofreading process, which
may lead to differences between this version and the Version of Record. Please cite this
article as doi: 10.1111/jors.12445.
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migrate into central locations and less aversive to high density at their young ages than
late boomers were in the 1980s. Consumption amenities are a critical factor that
distinguishes the net migration patterns between young and old adult groups, and became
a more important location factor for young adults in the 2000s (late Gen Xers and older
Millennials) than in the 1990s (early Gen Xers). There exists a considerable degree of
heterogeneity across UAs and neighborhoods even within the same UAs.
Keywords: Millennial generation, residential location choice, urban revival, net
migration, consumption amenities, urbanism
Introduction
After more than half a century of suburbanization, the central cities of the largest
metropolitan areas in the U.S. have seen a trend reversal; in recent years, cities have
grown faster than their suburbs (Acolin, Voith, & Wachter, 2016). Mirroring this turn
toward urban revival, there was a significant decline in driving between the mid-2000s
and mid-2010s, after decades of near-constant growth in automobile use (McDonald,
2015; Zhong & Lee, 2017). According to the literature, young and educated population
groups are at the center of these shifts in mobility and urbanization trends (Baum-Snow
& Hartley, 2016; Millsap, 2016).
While many journalists and researchers have focused on how today’s young
adults, the millennials, are driving urban renewal, others view the resurgence of central
cities as transitory. Skeptics believe that the urban concentration and reduced automobile
use of young adults are an outcome of their economic struggles and delayed lifecycle
events (Manville, King, & Smart, 2017) or merely the manifestation of the peak
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Millennial birth cohorts (Myers, 2016). As Millennials age and their economic conditions
improve, some suggest that they might move back to car-oriented suburbs, just as their
parents did (Blumenberg, Ralph, Smart, & Taylor, 2016; Klein & Smart, 2017).
However, if the urban concentration of Millennials is largely lifestyle-driven, reflecting a
generational shift in mobility and location preferences, more sustained urban revival
supported by multi-modal transportation systems is likely (Davis, Dutzik, & Baxandall,
2012; McDonald, 2015).
Millennials, born between 1981 and 2000, are the largest demographic cohort today,
surpassing their Baby Boomer parents (Myers, 2016), and occupy more than a third of the
American workforce, exceeding Generation X (Frey, 2018). Hence, the decisions that
Millennials make about where and how they live, work, and travel will greatly (re-)shape
American cities for decades to come. It is an important but difficult question to address
whether the city-bound and carless lifestyle of today’s young adults will persist or not,
because most Millennials have not reached the age or a stage in life at which members of
their parents’ generation typically settled in the suburbs. One way to infer how urban
revival might turn out in the future is to examine whether and to what extent the location
choices of millennials are different from those of previous generations at the same ages.
That is the approach taken in this paper. We investigate the net migration patterns of
young and old adult populations at the census tract level in the twenty largest U.S.
urbanized areas for the thirty-year period between 1980 and 2010.
This study contributes to the literature by enhancing our understanding of the location
choices of the millennial generation. It is the first paper to analyze the net migration, as
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opposed to simple population change, of Millennials at such a fine geographical scale. As
such, it can distinguish movers from stayers, and capture the location preference of
today’s young adults more accurately than previous studies. The difference between the
two approaches, net migration vs. population change, and contrasting results are further
discussed in the research design section.
Second, this study examines how various neighborhood characteristics influence the net
migration of young adults of different generations. In doing so, we develop a rich set of
carefully operationalized physical urbanism and consumption amenities variables.
Moreover, this study offers a framework to compare the location choices of young adults
in three different decades, with each representing a different generation. Although we do
not claim these as generational preferences because our aggregate analysis cannot control
for other demographic and socio-economic characteristics, the results still provide
important insights into how young adults’ location choice has been changing over
generations. Finally, we report a considerable degree of heterogeneity in young adults’
location choice across regions by studying the twenty largest UAs and address
heterogeneity within UAs by conducting quantile regression analyses.
Based on net migration, we show that Generation Xers and Millennials are more likely to
move into central locations and less averse to high density at young ages than late
boomers were in the 1980s. Consumption amenities are found to be a critical location
factor that explains the centralizing tendency of young adults that is distinctive from the
net migration pattern of older adult groups. The association between consumption
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amenities and young adults’ net migration became stronger in the 2000s (late Gen Xers
and older Millennials) than in the 1990s (early Gen Xers).
The next section reviews a recent debate on the location and mobility choices of
millennials, identifying research gaps. Section 3 explains how we build our unique
datasets and variables, and describes how we conduct the analysis. Section 4 visually
presents the net migration patterns of four adult cohorts—youngest (20-24), young (25-
34), midlife (35-44), and middle age (45-64)—for the past three decades, using maps and
descriptive analysis tools. Section 5 presents key findings from ordinary least square
(OLS) and quantile regression analyses. Section 6 discusses the findings and offers
suggestions for future research.
Generations and Location Choice of Young Adults
The resurgence of downtowns and central cities, led by Millennials, has drawn attention
to the impact of generational change on urban development. A generation, the aggregate
of individuals who are born in the same time period and age together experiencing similar
historical events, tends to share similar values, preferences, and behaviors, and hence is
an important vehicle of societal transformation (Ryder, 1965). Generation research
particularly emphasizes the role of experience from adolescence and early adulthood in
forming collective memories and shared traits (Mannheim, 1952; Schuman & Scott,
1989). Generations also leave their imprints on cities mainly through the shifts in
locational preferences tied with their lifestyles and changing demands for consumption
spaces and community facilities (Filion & Grant, 2017). For example, post-war prosperity
and consumerism largely shaped location and housing preferences of Baby Boomers for
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large suburban single family homes, leading to massive auto-oriented suburban
developments (Filion & Grant, 2017).
Now, urban lifestyles of a significant segment of Millennials, largely influenced by
economic restructuring and societal changes, are driving the resurgence of high-density,
central city neighborhoods with better transit access and walkable streets (Moos, 2014).
Delayed lifecycle events including marriage and child rearing among today’s young
adults, combined with the pursuit of higher education (Patten & Fry, 2015; Settersten Jr
& Ray, 2010), lead to living in amenity rich central cities where rental units and public
transit are readily available. These important social trends are often associated with long-
term economic restructuring toward a more knowledge-oriented economy that has
dramatically increased the returns to education (Goldin & Katz, 2007; Taylor, Fry, &
Oates, 2014) and educational attainment of more recent generations. Young and highly
educated workers tend to live in dense urban neighborhoods with a large labor market
and rich “learning externalities” (Duranton & Puga, 2004; Glaeser, 1999; Peri, 2002).
They also tend to have fewer children and smaller families (Roy, Schumm, & Britt, 2014)
that better fit with urban living. One question that has been examined in the literature is
whether the compositional effect of increasing share of young adults with higher
education or the changing marginal effect of education is driving urban revival (Lee,
2018; Millsap, 2016).
Research has shown that young and educated population groups also value consumption
amenities such as shopping, social, cultural, and recreational opportunities that
downtowns and lively urban neighborhoods offer (Couture & Handbury, 2016; Edlund,
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Machado, & Sviatschi, 2015; Glaeser & Gottlieb, 2006). An important question regarding
the role of consumption amenities in urban revival is whether the amenities available in
downtown have increased or valuation of the amenities has increased over time. While
several studies show that the demand for urban amenities have been rising (Couture &
Handbury, 2016; Glaeser et al., 2001; Rappaport, 2008), little evidence of increasing
amenities in central locations is found in the literature other than falling crime rates
(Ellen, Mertens Horn, & Reed, 2017; Glaeser & Gottlieb, 2006).
Urban neighborhoods of large metropolitan areas are increasingly delineated by
household demography and generational differences (Moos, 2014, 2016) and one cannot
fully understand today’s neighborhood changes without “a generational lens” (Vinodrai,
Moos, & Pfeiffer, 2017). Will the urban resurgence by Millennials be transitory? Many
researchers who believe it is mainly caused by the prolonged recession hold the view that
young adults will move out to suburbs as they get a job, form a family, and have children
(Kotkin, 2016). Further, Myers (2016) argues that urban revival will subside as the
Millennial cohort passes young adulthood and several recent reports seem to support his
prognosis (Frey, 2017; Kolko, 2016, 2017; Kotkin, 2016). However, the return of today’s
young adults to suburbs may not be automatic if new lifecycle related norms are not just a
short-term response to the recession, but also a result of long-term post-industrial and
societal restructuring (Moos, 2014; Moos & Revington, 2017).
Several recent empirical studies examine the location choices of generation cohorts.
Moos (2014) investigates the concentration of young adults to high density and transit
neighborhoods in Vancouver and Montreal, Canada, but his study period (1980 and 2006)
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only covers Baby Boomers and Gen Xers and the findings of a case study in two cities
may not generalize to a broader population. Couture and Handbury’s (2016) analysis of
all metropolitan areas in the U.S. shows college-educated young adults are more attracted
to amenities like theaters and bars than non-college-educated and older adult groups, and
the gaps in locational preferences are generally becoming wider. While they use
consumption amenity indices constructed in an innovative way, their regression models
fail to include many other neighborhood attributes such as transportation variables. We
also believe the change in young adults’ share of census tract population, their dependent
variable, might underestimate the location preference of young adults because it does not
distinguish stayers from movers as further discussed in the research design section.
Other studies perform individual-level analyses using public use microdata. Millsap’s
(2016) linear probability model shows that the effect of education on young adults’
probability of living in a central city did not change significantly from 1990 to 2011.
Instead, increased educational attainment of the more recent generation accounts for the
increased urban presence of young adults. A more extensive analysis in a similar line by
Lee (2018) finds the effects of other generational characteristics including racial/ethnic
diversity and delayed life-cycle events as well as that of higher education. An individual
level analysis has certain advantages over an aggregate analysis. By controlling for
individual demographic and socio-economic characteristics, it can test a number of
hypotheses proposed to explain urban revival. In particular, one can distinguish the
changes in marginal effects of location factors from composition effects. A disadvantage
is that the lowest level of geographic aggregation identified in the data, the public use
microdata area, is too large to study the effects of neighborhood level characteristics. For
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example, the only neighborhood variable included in Millsap (2016) is a central city
dummy and distance from the CBD in Lee (2018).
The current study fills a gap in the literature by investigating the census tract level net
migration patterns, not a gross change of cohort size, of young and old adults in the top
twenty U.S. urbanized areas for the thirty-year period between 1980 and 2010. We use a
rich set of physical urbanism and consumption amenities variables and test how their
marginal effects have changed over generations.
Research Design
3.1: Research questions
The main purpose of this paper is to address the questions whether and to what extent the
Millennial generation is different from previous generations in residential location
choice. To address the key issue, we investigate the following research questions:
- When measured by the net migration of birth cohorts, not by gross change of the
same age groups, are Millennials moving into more urban neighborhoods in
central locations?
- What are the dominant location factors that attract Millennials (and young adults
in previous decades)?
- How significantly does the location preference of today’s Millennials differ from
those of early Generation Xers (Gen Xers) and Baby Boomers at the same ages in
previous decades?
- Is there a significant variation in the top twenty urban areas in intra-urban
relocation patterns of young adults?
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3.2: Study areas and age cohorts
We analyze the location choice of young adults in the largest twenty UAs in the U.S.—
i.e., the largest five UAs from each of the four Census Regions, according to the 2000
decennial U.S. Census. While Washington, D.C. and Baltimore UAs technically belong
to the Southern Region, they share more commonalities with Northeastern cities in spatial
structure and urban history. Thus, we include the two UAs in the Northeast. Previous
studies show that the resurgence of young populations in central cities is more
pronounced in large metropolitan areas. These UAs account for 33 percent of the total
U.S. population as of 2000 and include:
- Northeast: New York, Philadelphia, Boston, Washington, D.C., and Baltimore;
- Midwest: Chicago, Detroit, Minneapolis, St. Louis, and Cleveland;
- West: Los Angeles, San Francisco, Phoenix, Seattle, and San Diego;
- South: Miami, Dallas, Houston, Atlanta, and Tampa.
We use UA boundaries instead of metropolitan statistical areas (MSAs) used in most
previous studies mainly for two reasons. First, the use of UA boundaries allows us to
limit our analysis to urban and suburban census tracts. Since the building blocks of a
MSA are counties, MSAs include many rural communities within their boundaries, which
could distract the focus of the analysis. Second, UA boundaries are more consistently
delineated based on physical urban form than MSAs as the U.S. Census Bureau applies
the same minimum density thresholds across the regions.
UA boundaries are updated for each census year to reflect changing urbanization
patterns. To maintain the same study area for the thirty-year study period, we use 2000
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UA boundary definition. For each decade, we select beginning year census tracts whose
centroids are included in the 2000 UA boundaries. Then, we convert ending year census
data onto beginning year census tracts so that the data from the two census years are on
the same geography. We reorganize the data, using census tract relationship files
published by the U.S. Census Bureau for the 1990s and 2000s. But, since the relationship
file is not provided for the 1980s, we have to rely on area ratios between 1980 and 1990
census tracts.
Our analysis focuses on four adult population groups in each decade of our study period
from 1980 to 2010. In particular, the location choice of young adult cohort of age 25 to
34 (in the end year of each decade) is of the primary interest because this young age
group represents a different generation in each decade: the late Baby Boomers (defined as
those born between 1946 and 1964) in the 1980s, early Generation Xers (born between
1965 and 1980) in the 1990s, and late Gen Xers & early Millennials (born between 1981
and 2000) in the 2000s. This young adult group (25-34) also represents a stage in human
life in which they are most likely to have important life cycle events such as the first job,
home purchase, marriage, and childrearing. We have a separate age group of 20-24
because these youngest adults tend to be still in a college and/or are less likely to make
their own location choice than the young adult group of age 25-34. The location choice of
these two young adult groups will be compared with that of two older adult groups,
midlife (35-44) and middle age (45-65) groups.
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3.3: Estimation of net migration
In order to better capture the location decisions of adult population groups at different life
stages, we analyze the net migration patterns of birth cohorts at the census tract level as
opposed to a simple population change in the same age groups at varying points in time.
For example, Couture and Handbury (2016) compare the population share of the age
group 25–34 in 2010 (born in 1976–1985) with that of 2000 (born in 1966–1975).
Although convenient, this approach does not distinguish those who aged in the same
place from those who moved to the place; however, movers and stayers are likely to have
different location preferences. In particular, those young adults who aged in their parents’
home in the suburbs would be counted as an increase in young adult population by this
approach, even though their true location preference might be different. Thus, we
estimate and analyze the net migration of young adults who were 15 to 24 years old in the
beginning year and turned 25 to 34 years old in the ending year of each of the three
decades between 1980 and 2010. Figure A1 in the appendix highlights the contrasting
results of the two different approaches, net migration versus population change. When
location choice is measured by percent population change (panel A), the age 20-29 group
does not show a distinctive pattern from overall suburbanizing population (panel B) in
the 2000s in the Washington, DC UA. In contrast, the measure of net migration (panel C)
clearly shows a different location choice of older Millennials (20-29 in 2010). They have
concentrated into neighborhoods with rich consumption amenities that are mainly
clustered in the central city and along public transportation corridors (Panel D).
We estimate net migration using a modified cohort-component method because migration
data do not exist at sub-county levels. First, we estimate an expected population size in
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the ending (target) year for each age-sex cohort, using the cohort size in the beginning
(base) year and the age-and-UA-specific death rates published by the Centers for Disease
Control and Prevention (CDC). In the second step, we obtain the net migration of each
cohort by subtracting the expected cohort size from the actual cohort size in the ending
year. Positive net migration counts imply more in-migrants than out-migrants, and vice
versa. Since we operate with 5-year age cohort using decennial census data, we repeat the
same procedure twice for each decade.
We use the central county’s death rates for each UA since the CDC’s dataset has many
undisclosed numbers for smaller non-central counties. In general, the death rate of young
adult population (25-34) is higher in central urban areas than suburbs due to more violent
crimes, accidents, and poverty. This might lead to overestimated net migration of young
adults into suburban census tracts via overestimating their deaths and undercounting
stayers. As a result, the difference in young adults’ net migration between central cities
and suburbs may be presented in a slightly muted fashion in our analysis.
Pt, x+1 = Pb, x – Dx’ + IMx’OMx’
IMx’OMx’ = Pt, x+1(Pb, x – Dx’),
Where b is the base year; t is the target year; x is a sex-age cohort; x+1 is the next age cohort of
the same sex; x’ is the cohort x in the base year and aging to x+1 in the target year; Pb, x is the
population size of a 5-year age cohort in the base year; Pt, x+1 is the population size of the next age
cohort in the target year; IMx’ and OMx’ are the number of in-migrants and out-migrants during the
5 year period, respectively; and Dx’ is the number of death for the 5 year period.
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Maps in Figure 1 shows how the spatial patterns of net migration differ among the four
adult groups and changed over time, using the Washington, D.C. urbanized area as an
example. In all three decades, the youngest adult group of age 20 to 24 stands out in net
migrating toward more compactly developed neighborhoods along main public transit
corridors including downtown, whereas two older adult groups of age 35 to 64 show a
continued decentralization toward low-density suburbs. Interestingly, young adults of age
25 to 34 showed a not much different suburbanization pattern from that of midlife (35-
44) and middle age (45-64) groups in the 1980s, but their net-migration pattern became
similar to that of the youngest (20-24) group by the 1990s and even more so in the 2000s.
It seems that Gen Xers and Millennials (25-34 in 2000 and 2010, respectively) prefer
more urban neighborhoods than baby boomers (25-34 in 1990) at the same age at least in
the Washington, D.C region.
3.4: Measuring neighborhood level urbanism and consumption amenities
We operationalize urbanism in two dimensions: physical neighborhood characteristics
and consumption amenities. There has been an extensive effort over the past two to three
decades to define and quantify urban form components that facilitate sustainable
urbanism—density, diversity, design, distance to public transit, and destination access
(Cervero & Kockelman, 1997; Cervero, Sarmiento, Jacoby, Gomez, & Neiman, 2009;
Ewing & Cervero, 2010). We develop census tract level variables that correspond to
these urban form components except diversity for the beginning year of each decade—
i.e., 1980, 1990 and 2000—using various data sources including the Decennial Census,
historic Topologically Integrated Geographic Encoding and Referencing (TIGER) data,
the Census Transportation Planning Package (CTPP), and Homeland Infrastructure
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Foundation-Level Data (HIFLD). TIGER GIS files are used to calculate street density. To
identify the locations of rail transit stations in each census year, we use the public transit
stations GIS file from HIFLD and track each station’s opening year information from
transit agency websites and other sources. We define employment centers including the
CBD and subcenters in each UA, using census tract level employment data from the 2000
CTPP and a geographically weighted regression (GWR) procedure described in Lee
(2007) and Lee and Lee (2014).
Specific measurements include:
Population density per acre;
Street density to measure street design, street length (miles) per acre;
Binary indicator of location within a half mile buffer from a frequent rail transit
station;
Distance to the closest station for frequent rail transit in miles, Dstop=1/Distance;
Binary indicator of location in the central city of the region;
Distance to the central business district (CBD) in miles, DCBD=ln(Distance CBD);
We define the central city in two alternative ways. First, we define the largest
incorporated place in each UA as the central city and the rest as suburbs whether or not
they are incorporated. While the portion and role of the core central city varies from one
region to another, this political boundary still matters in terms of taxing and public
services provision—most importantly public transportation and school districts. Second,
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we also use the distance from the CBD to define an alternative set of inner cities census
tracts since many central municipalities include communities with suburban
characteristics such as San Fernando Valley in Los Angles. We experimented a range of
threshold distances used in previous studies (Baum-Snow & Hartley, 2017; Cortright,
2014; H. Lee, 2018) and settled with 5 miles. A descriptive analysis in Table 2 uses the
political definition of a central city and all regression models use the distance based
definition, 5 miles from the CBD. The results of regression models using alternative
central city definition will be presented in Table A5 in the appendix.
Using all input variables including the central city dummy and a factor analysis, we
extract final urbanism factors that we use in regression models for two decades, 1990-
2010. As shown in Table A1 in the appendix, we extract three variables, density, access
to transit, and central location. Any input variables showing low factor loadings are
excluded in the final factor analysis. We run three decade models (1980-2010) separately
with only available individual urban form variables because some of the input variables
are not available for 1980.
Urban researchers have only begun to operationalize the notion of consumption
amenities. Bereitschaft (2014, 2017) provides rich descriptions of “creative-cultural
districts” as nodes of cultural production and consumption that appeal to young
professionals. Couture and Handbury (2016) develop a consumption amenities index
based on the number of retail, entertainment, sports, restaurant, and other service
establishments. However, developing this kind of index dating thirty years back is nearly
impossible or prohibitively expensive. Thus, we use the number of jobs in retail trade and
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entertainment, recreation, and food services sectors from the 1990 and 2000 CTPP data
as a proxy for these businesses. A complete set of variables is available only for 1990 and
2000; but street design variables and consumption amenities are missing in the 1980 data
set. Thus, our three-decade regression models do not include consumption amenities
while two-decade models utilize a complete set of urbanism variables.
3.5: Regression models
To examine the roles of various location factors in attracting different age groups in each
of the three decades, we conduct a series of regression analyses. The unit of analysis is a
census tract and the data will be pooled across the twenty UAs and over the three
decades. Interaction terms of location factors and period indicators will enable us to
investigate how the impacts of these urban neighborhood attributes on net migration of
the same age groups change over time and generations.
𝑌
𝑖𝑗𝑡 =𝛼+𝛽1𝑋1𝑖𝑗𝑡 +𝛽2𝑋2𝑖𝑗𝑡 +𝛽3𝑇+𝛽4𝑈𝐴 +𝛾1𝑋1𝑇+𝜀𝑖𝑗𝑡,
Yijt is the dependent, net migration into census tract i in UA j in decade t; X1 is neighborhood
urbanism variables including consumption amenities; X2 is other control variables, including many
socio-demographic variables of each census tract, population size, and population share of the
same age group in the beginning year; T is dummy variables for each of the three decades; UA is
dummy variables for each of the 20 UAs; X1T is interaction terms of key urbanism variables with
decade indicators; α, βs, and γ are the coefficients to be estimated; and ε is an error term.
The dependent variable of the regression model is the net migration of the four different
age groups in each decade. The right hand side covariates include socio-demographic
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location factors and other control variables as well as the aforementioned variables that
measure neighborhood level urbanism. These include log population size, population
share of the same age group, percent non-Hispanic white population, percent foreign
born, percent professionals, log median household income, percent unemployment rate,
and percent multifamily housing stock. While school quality plays a critical role in the
residential location choice of those with school-age children, including our target cohort
of 25-34, reliable measures across 20 UAs and three decades are not available. Thus, we
collected a school quality measure for individual census tracts as of 2017 from a non-
profit organization (www.greatschools.org), and we imputed their historical values with
tract-level socioeconomic attributes. We find the results for our key variables are
consistent with and without such imputed variables. However, we decided to drop this
variable from our final models because of high multicollinearity with other socio-
economic variables.
We employ both ordinary least square (OLS) and quantile regression models. OLS
models are to examine the average impacts of location factors on net migration of adult
populations. We use quantile regression approaches because we consider a possibility
that the qualities comprising lively urban neighborhoods might only matter or are more
important in popular destinations of young adults, often called ‘hipster hotspots’.
Quantile regression models, by revealing heterogeneous correlation patterns between
covariates and the outcomes of interest at various quantile points, shed light on
heterogeneous behaviors across individuals or locations as in this study, and offer richer
policy insights than a conditional expectation at the mean would do (Koenker and
Hallock, 2001).
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As indicated in the equation above, we pool the data across 20 UAs and two/three
decades and use interaction terms to identify decade-specific coefficients for key
variables. When running a pooled model, we standardize most variables including the
dependent by UA and decade except those with substantive meanings such as a binary
indicator of location within a half mile from transit stations. We standardize variables to
take into account varying growth trends and spatial contexts across UAs. For example,
not very attractive neighborhoods in Phoenix, AZ might have more in-migration than
popular locations in Detroit, MI. Further, the most compactly developed neighborhoods
in Houston or Dallas, TX may not be so by New York’s standard. Standardization of
variables will also allow us direct comparison of coefficients across birth cohorts and
UAs since they are estimated in the unit of standard deviation.
Finally, we also run spatial models to deal with likely spatial auto correlation in census
tract level net-migrations. However, we are allowed to run spatial models only for each
decade separately since a spatial pooled model requires too large a contiguity matrix.
Thus, we choose OLS and quantile regression as our main results and include the results
of decade-specific spatial error, spatial lag, and spatial quantile models in the appendix.
Descriptive Analysis Results
Table 2 presents net migration patterns of the four age groups in the central city versus
suburbs for the three recent decades. Apparently, the youngest group of age 20-24 shows
the most distinctive location choice, largely moving into central cities in all three decades
except only a few cities in the Midwest and Baltimore. Two older adult groups, midlife
(35-44) and middle-age (45-64), show an exactly opposite location pattern away from
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central cities across the board in all three decades. There seems no generational turn in
these three adult groups.
It is young adults of age 25-34 that show substantial changes in location choice over time.
The net migration pattern of young adults in the 1980s—late Boomers in this period
was not much different from that of two older adult groups. However, the same age group
who are early Gen Xers in the 1990s and late Gen Xers plus early Millennials in the
2000s shows much weaker preference for suburban locations than the previous
generation. Suburbs still receive relatively more young adults than central cities even in
the 1990s and 2000s, but the gaps became much smaller than were in the 1980s. Thus,
the touted shift in location choice of young (25-34) adults seems to have come earlier
with Generation X than are generally speculated. While “downtown rebound” by young
adults in the 1990s was well reported in several earlier studies (Eugenie Ladner Birch,
2002; Eugenie L Birch, 2005; Sohmer & Lang, 2001), the current study suggests a
possibility that this trend was present across the central city beyond the downtown
boundary or the downtown rebound was strong enough to lead to a positive net migration
of young (25-34) adults, aggregately measured at the central city level.
It is also notable that there is considerable variation across UAs. The central city has
always been relatively more or equally attractive to young (25-34) adults in San
Francisco and New York; whereas a shift toward this trend has come with early Gen Xers
in the 1990s in Seattle and with late Gen Xers and Millennials in the 2000s for
Washington, D.C. and Miami. On the contrary, net-migration rates have been higher in
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suburban areas throughout the three decades in several UAs such as Boston, Cleveland,
Detroit, and Minneapolis.
Figure 2 also corroborates a similar trend over the three decades. Here, we estimate a
spline regression of percent net migration on distance from the CBD for each age group
separately by the Census Region and decade. Young adults’ (25-34) net migration rates
were an increasing function of the distance from the region’s CBD (except far outskirt
areas of the Eastern UAs) just as that of older age groups in all four regions in the 1980s.
However, the spline regression lines of young adults in the 1990s (early Gen Xers)
became much flatter and some significant peaks in downtown areas emerged in the 2000s
when late Gen Xers and older Millennials grew to be young (25-34) adults. Other three
age groups do not show a significant change in their location preferences for central
locations over the three decades.
Location factors driving intra-urban location choice of young adults
5.1: Average effects of neighborhood attributes on net migration
Table 3 shows how neighborhood attributes of individual census tracts in the beginning
year influence the net in-migration of four adult cohorts in each decade. Models (1) - (4)
present the results of three-decade models with three urban form variables—central city
dummy, density and transit accessand Models (5) - (8), two-decade models, include
three urbanism factor scores and a consumption amenities variable. We interact all key
variables with each of the three decade dummy variables to examine potential generation
effects. Overall, all age groups seem to be attracted toward central locations but avoid
high density neighborhoods. The impacts of three urbanism variables on net-migration,
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when viewed on average as presented by OLS regression models, seem to work in the
same direction across the four age groups although there is a variation in the magnitude.
It is the consumption amenities variable that shows more diverging preferences between
young and old adult groups.
Surprisingly, the central city dummy (defined as five miles from the CBD) and central
location factor score show mixed patterns for midlife group (35-44) and middle age (45-
64), often showing significant and positive effects on net migration. This counter-
intuitive result appears to conflict the well-established suburbanization trend in U.S.
metropolitan areas. We believe a part of the reason is spatial autocorrelation. The five
mile dummy variables show either a negative sign or insignificance for the two older
adult groups (35-44 and 45-64) in spatial regression results presented in table A3. It
should also be noted that the size of negative coefficients of density is substantially larger
than that of central city variable for the two older groups. What we observe in the
previous section’s descriptive analysis is the net effects. In case of two younger adult
groups (20-24 and 25-34), the relative coefficient sizes of central city and density are vice
versa.
OLS estimates under alternative definitions of the central city, the largest municipality
and the area within 3, 5, and 10 miles from the CBD, show similar results (Table A3).
Regardless of the definition, the youngest (20-24) adult group’s centralization pattern is
the strongest in the 2000s while young (25-34) adults show a significant shift toward
stronger centralization in the 1990s, which is consistent with the descriptive analysis
findings in the previous section. The net migration of young adults into central
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neighborhoods is stronger in the 1990s (early Gen Xers) when the central city is defined
broadly (the largest city and 10 miles from the CBD); it is stronger in the 2000s (late Gen
Xers and older Millennials) when the central neighborhoods are defined narrowly (3 and
5 miles).
Access to public transit is also valued especially by young (25-34) and midlife (35-44)
groups, but not by the youngest (20-24). The transit factor score actually shows a
negative sign for the youngest in the 2000s although it is not significant in spatial models
shown in Table A3. This is puzzling as the youngest adults are the most frequent transit
users (Brown, Blumenber, Taylor, Ralph, & Voulgaris, 2016; Buehler & Pucher, 2012).
It may be because our transit access variable only captures the access to rail transit but
not bus systems. Metro lines typically serve more prominent parts of the city including
downtowns and metro access is more likely to be capitalized into housing prices and rents
than bus access. Thus, high metro access neighborhoods can be unaffordable to poor
young households.
It is consumption amenities—proxied by the density of retail, entertainment, recreation,
and food services employment—that have the most contrasting effects on net migration
between young and old adult groups. Whereas both midlife (35-44) and middle age (45-
64) groups moved away from mixed-land use neighborhoods, the youngest (20-24) group
were attracted by these consumption, entertainment, and cultural opportunities in the two
recent decades. Young adults of age 25-34 were indifferent in the 1990s (early Gen
Xers), but came to value the access to consumption amenities in the 2000s (late Gen Xers
& older Millennials). The coefficient for the youngest (20-24) is also larger in the 2000s
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(Millennials) than in the 1990s (late Gen Xers). This finding is consistent with the
consumption amenities literature that shows the demand for urban amenities have been
rising over the years (Couture & Handbury, 2016; Glaeser et al., 2001; Rappaport, 2008).
The increasing marginal effect of consumption amenities on young adults’ location
decision has an important implication on urban development in the future although more
research needs to be done on whether the changes are largely composition effects or a
generational preference shift.
5.2: Heterogeneous effects of neighborhood attributes on net migration
The OLS regression results in the previous section shows that our target cohort of age 25-
34 at the end of each decade moved into the neighborhoods in central locations with
better transit access but with lower density. However, the OLS results do not identify a
clear generational difference in young (25-34) adult’s net migration between the 1990s
(early Gen Xers) and the 2000s (late Gen Xers & older Millennials) except that
consumption amenities became a significant location factor in the 2000s. We suspect that
outliers on both ends of our net migration measure might have substantially affected OLS
estimates. Thus, this section presents the results of quantile regression models for the
target cohort under the same specification, which would reveal varying effects of
urbanism attributes across the neighborhoods with different levels of young (25-34)
adults’ net-migration.
Overall, as shown in Table 4, there are considerable variations in the size of coefficients,
with the impacts of all key variables generally increasing with the level of net migration.
In other words, the effects of urbanism attributes are stronger in those neighborhoods that
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attract more young (25-34) adults. This is the case for nearly all urbanism variables
regardless of whether the impact is positive or negative. It should be also noted that the
OLS estimates are considerably larger than those at the median, which is suggestive of
the skewing effects of outliers on the OLS estimates.
The changes over time in the coefficients at the 75 percentile are not much different from
OLS results. The net migration of young (25-34) adults into central and mixed-use
neighborhoods became stronger in more recent decades. The negative impact of high
density has also weakened over time. The only variable whose coefficient is moving in
the opposite direction is transit access. As discussed above, this trend seems to indicate
that the access to metro stations are becoming increasingly unaffordable to young adults.
5.3: Heterogeneous effects in top twenty urbanized areas
Table 5 presents the coefficients of the consumption amenities variable from quantile
regression models of young adult’s (25-24) net-migration run for each of the top 20 UAs
and the last two decades separately. There is a considerable degree of heterogeneity both
in terms of the effects and their change over time. Interestingly, net migration’s
association with consumption amenities became much stronger in the 2000s in the four
Western UAs except Phoenix; however this trend is not present in the other three regions.
In fact, strong consumption amenities effects observed in the 1990s for many Eastern and
Midwestern UAs including New York, Washington, D.C., Detroit, and Minneapolis,
became less or non-significant in the 2000s. Further research is needed to better interpret
this result. One notable finding is that young adults in the South including a Western sun-
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belt city Phoenix are not significantly attracted to mixed-use neighborhoods in both
recent decades.
In sum, the recent urban revival by young adult population may not be present in all cities
and regions, but is more pronounced in certain types of urban areas, especially in the
West, that offer neighborhoods with concentrated urban amenities in central cities.
Conclusions
This paper investigates census tract level net migration patterns of younger and older
adult populations in the twenty largest UAs for the thirty-year period between 1980 and
2010. Descriptive analysis finds that young adults of age 25-34 show a considerable shift
in their location choice toward central locations in the 1990s, not the 2000s, indicating a
possibility that the shift in young adults’ location choice occurred earlier with Gen Xers
than is generally speculated. OLS and quantile regression analysis results also suggest
that young adults (25-34) in the 1990s share more commonality in location preference
with those of the 2000s (a mix of older Millennials and late Gen Xers) than with late
Boomers at their young ages in the 1980s. The two recent generations prefer more central
locations and are less averse to high density than late Boomers were in the 1980s.
The location choices of younger and older adult groups show the most divergence
with respect to the role of consumption amenities. Whereas both midlife (35-44) and
middle-age (45-64) groups moved away from mixed-land use neighborhoods, the
youngest adults of age 20-24 were attracted by consumption, entertainment, and cultural
opportunities in the two recent decades. Young adults of age 25-34 were indifferent in the
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1990s (early Gen Xers), but net-migrated into the neighborhoods with a higher access to
consumption amenities in the 2000s (late Gen Xers & early Millennials).
We also find a considerable degree of heterogeneity in the effects of urban neighborhood
attributes on young (25-34) adults’ net migration, both across UAs and neighborhoods.
Quantile regression results show that both the positive effects of central location and
transit access and the negative impact of density are substantially larger in the
neighborhoods and UAs that are popular among young (25-34) adults. The recent urban
revival by young population may not be present in all cities and regions, but is more
pronounced in certain types of cities that offer neighborhoods with concentrated urban
amenities in the central city.
A limitation of the paper is inherent in the aggregate level of observation. This study
cannot control for the varying demographic and socio-economic attributes of the
members in the four age cohorts in different decades. Thus, although this study can
explore aggregate changes in the relationships between location factors and net migration
over time, it cannot estimate the extent to which these changes are driven by generational
preferences or changes in cohort compositions. In contrast, an analysis of young adult’s
location choice at the individual level would enable us to examine interactions between
location factors and individual level characteristics. As the current study suggests, these
interactions may have changed over time with generations. Lee’s (2018) individual level
multinomial logit analysis is an example of this approach. However, a trade-off involved
in using publicly available microdata is a loss in spatial resolution. A study using
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restricted-use microdata at the Federal Statistical Research Data Center, with geography
identified at lower levels, seems to be a promising next step in this literature.
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Tables
TABLE 1. Generations represented by Four Adult Cohorts in Each Census Year
Adult cohorts
Age
1980
1990
2000
2010
Youngest
20
-24
Baby Boomers
Generation Xers
Generation Xers
Millennials
Young
25
-34
Baby Boomers
Baby Boomers
Generation Xers
Millennials & Gen Xers
Midlife
35
-44
Silent Generation
Baby Boomers
Baby Boomers
Generation Xers
Middle age
45
-64
Silent Generation
Silent Generation
Baby Boomers
Baby Boomers
Notes: This study defines Millennials as those born between 1981 and 2000; Generation Xers between 1965
and 1980; Baby Boomers between 1946 and 1964; and Silent Generation between 1925 and 1945.
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TABLE 2. Percent Net Migration of Four Adult Groups to Central Cities vs. Suburbs,
1980-2010
a) 1980 to 1990
b) 1990 to 2000
UA Name
Youngest (20-24)
Young (25-34)
Midlife (35-44)
Middle Age (45-64)
CC Suburbs CC Suburbs CC Suburbs CC Suburbs
Baltimore 15 14 -24 11 -28 10 -14 -1
Boston 80 6-29 0-45 3-11 -6
New York 39 -3 16 5-9 12 -5 -5
Philadelphia 21 -13 -19 2-20 7-9 -2
Washinton DC 46 24 -18 17 -32 8-17 -9
Chicago 32 -8 811 -24 8-10 -3
Cleveland 1-36 -7 10 -22 4-11 -1
Detroit -29 -17 -7 13 -25 2-19 -5
Minneapolis 94 14 -5 12 -44 7-17 -6
St. Louis 12 -16 -13 2-34 1-13 -6
Atlanta 49 45 10 50 -20 29 -13 4
Dallas 72 23 16 23 -20 10 -10 -3
Houston 47 -16 13 36 -18 15 -9 1
Miami 316 629 -1 27 019
Tampa 27 8-1 17 -5 21 -1 23
Los Angeles 38 14 -3 -2 -25 -10 -16 -12
Pheonix 56 60 30 41 939 145
San Diego 56 34 -10 -5 -16 0-7 -1
San Franci sco 75 35 44 16 -24 -6 -9 -7
Seattle 103 16 25 19 -29 12 -6 -2
UA Name
Youngest (20-24)
Young (25-34)
Midlife (35-44)
Middle Age (45-64)
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c) 2000 to 2010
Notes: Percent net migration = number of net migrants/cohort population in the beginning year*100. The
concept of central places for urban areas is no longer used since the 2010 Census. We define the largest
incorporated place in each UA as the central city and the rest as suburbs whether or not they are
incorporated.
TABLE 3. Net Migration of Four Adult Cohorts, 1980-2010 (OLS Regression)
Three-decade models Two-decade models
(1)
Youngest
(20-24)
(2)
Young
(25-34)
(3)
Midlife
(35-44)
(4)
Middle
(45-64)
(5)
Youngest
(20-24)
(6)
Young
(25-34)
(7)
Midlife
(35-44)
(8)
Middle
(45-64)
Central city '80s 0.025
** 0.078
*** 0.111
*** 0.065
***
Central city '90s 0.031
*** 0.123
*** -0.047
*** -0.085
***
Central city '00s 0.130
*** 0.175
*** 0.027
** -0.088
***
Central city '90s*
0.015
** 0.083
*** -0.005
0.062
***
CC Suburbs CC Suburbs CC Suburbs CC Suburbs
Baltimore 31 13 126 -19 -5 -5 7
Boston 109 7-28 12 -48 -9 -9 -2
New York 38 -7 14 14 -23 -4 -8 -4
Philadelphia 46 -21 -2 12 -17 -2 -5 1
Washinton DC 89 19 15 36 -28 -4 -6 -2
Chicago 25 -31 211 -34 -1 -19 -3
Cleveland -7 -53 -19 14 -31 -4 -15 -2
Detroit -33 -26 -38 9-30 -6 -29 -2
Minneapolis 82 -13 -9 17 -43 -15 -22 -6
St. Louis 32 -27 312 -27 -6 -10 1
Atlanta 69 7-1 20 -29 1-17 0
Dallas 32 -3 -3 17 -31 -2 -15 -3
Houston 34 -20 742 -21 18 -12 4
Miami 38 629 17 1 2 9 8
Tampa 31 13 219 -11 2-6 14
Los Angeles 36 02-1 -20 -11 -11 -8
Pheonix 223 -10 1-22 -6 -15 12
San Diego 64 22 -4 1-26 -6 -11 0
San Francisco 92 20 27 11 -36 -12 -7 -9
Seattle 99 -4 17 29 -26 1-15 -3
UA Name
Youngest (20-24)
Young (25-34)
Midlife (35-44)
Middle Age (45-64)
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Central city '00s*
0.057
*** 0.050
*** 0.083
*** 0.024
**
Population density '80s -0.059
*** -0.146
*** -0.145
*** -0.262
***
Population density '90s 0.037
*** -0.065
*** -0.283
*** -0.182
***
Population density '00s -0.021
*** -0.111
*** -0.269
*** -0.281
***
Population density '90s*
0.018
*** -0.061
*** -0.252
*** -0.189
***
Population density '00s*
-0.027
*** -0.079
*** -0.226
*** -0.269
***
Access to transit '80s 0.011
*** 0.021
*** 0.025
*** 0.023
***
Access to transit '90s 0.001
0.014
*** 0.004
** 0.005
***
Access to transit '00s 0.001
0.011
*** 0.007
*** 0.007
***
Access to transit '90s*
0.005
0.085
*** 0.003
0.007
Access to transit '00s*
-0.015
** 0.053
*** 0.027
*** 0.008
Consumption amenity ' 90s
0.055
*** 0.003
-0.033
*** 0.004
Consumption amenity ' 00s
0.076
*** 0.033
*** -0.062
*** -0.010
*
decade '90s 0.000
0.027
*** 0.045
*** 0.035
***
decade '00s -0.027
*** 0.046
*** 0.071
*** 0.026
*** -0.010
* 0.023
*** 0.043
*** -0.005
ln(population) 0.016
*** 0.068
*** -0.061
*** -0.112
*** 0.019
*** 0.042
*** -0.106
*** -0.120
***
%Youngest (20-24) at beginning 0.281
***
0.256
***
%Young (25-34) at beginning
0.127
***
0.125
***
%Midlife (35-44) at beginning
-0.047
***
-0.038
***
%Middle (45-64) at beginning
0.011
***
0.044
***
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% non-Hispanic White 0.132
*** 0.108
*** 0.011
*** 0.097
*** 0.109
*** 0.137
*** 0.049
*** 0.149
***
% foreign born 0.077
*** 0.030
*** 0.027
*** 0.054
*** 0.052
*** 0.012
*** 0.005
0.033
***
% professionals 0.059
*** 0.068
*** -0.001
-0.085
*** 0.036
*** 0.069
*** -0.004
-0.128
***
ln(median household income) -0.118
*** -0.032
*** 0.122
*** 0.044
*** -0.095
*** -0.015
*** 0.146
*** 0.060
***
% unemployed -0.088
*** -0.027
*** 0.054
*** 0.007
-0.091
*** -0.032
*** 0.060
*** 0.011
**
% multifamily housing units 0.309
*** -0.044
*** -0.193
*** 0.097
*** 0.296
*** -0.051
*** -0.247
*** 0.054
***
Observations 52,331
52,331
52,331
52,331
36,866
36,847
36,848
36,835
R2 0.444
0.181
0.296
0.132
0.446
0.189
0.338
0.122
Adjusted R2 0.443
0.180
0.295
0.132
0.445
0.188
0.337
0.121
Notes: Models (1) to (4) present the results of three-decade models from 1980 to 2010 and models (5) to (8)
are two-decade models from 1990 to 2010. The dependent variable of all models are the net migration of
four birth cohorts, standardized for each decade and UA. Here, standardization helps compare coefficients
across cohorts and UAs while taking into account the varying contexts of individual UAs. The binary
indicator variables for each UA are included in the models, but not shown here for brevity. All key
variables are interacted with dummy indicators of each decade to examine generation effects. The sample
of each model excludes top and bottom 1% in terms of net-migration to minimize the influence of outliers.
* Urbanism variables for two-decade models are factor scores, derived from multiple urban form variables
(see Table A1 for details).
TABLE 4. Net Migration of Young (25-34) Adult, 1980-2010 (OLS and Quantile
Regression)
Three-decade models Two-decade models
(1) (2) (3) (4) (5) (6) (7) (8)
25th 50th 75th OLS 25th 50th 75th OLS
Central city '80s 0.063
*** 0.047
*** 0.038
*** 0.078
***
Central city '90s 0.054
*** 0.078
*** 0.096
*** 0.123
***
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Central city '00s 0.045
*** 0.093
*** 0.161
*** 0.175
***
Central city '90s*
0.056
*** 0.058
*** 0.057
*** 0.083
***
Central city '00s*
0.009
0.019
*** 0.044
*** 0.050
***
Population density '80s -0.038
*** -0.105
*** -0.218
*** -0.146
***
Population density '90s 0.002
-0.039
*** -0.128
*** -0.065
***
Population density '00s -0.036
*** -0.070
*** -0.137
*** -0.111
***
Population density '90s*
0.032
*** -0.034
*** -0.136
*** -0.061
***
Population density '00s*
0.006
-0.039
*** -0.112
*** -0.079
***
Access to transit '80s 0.010
** 0.026
*** 0.041
*** 0.021
***
Access to transit '90s 0.009
*** 0.018
*** 0.032
*** 0.014
***
Access to transit '00s 0.004
*** 0.007
*** 0.018
*** 0.011
***
Access to transit '90s*
0.067
*** 0.071
*** 0.090
*** 0.085
***
Access to transit '00s*
0.033
*** 0.031
*** 0.055
*** 0.053
***
Consumption amenity '90s
-0.009
** 0.006
0.017
*** 0.003
Consumption amenity '00s
-0.009
* 0.017
*** 0.033
*** 0.033
***
decade '90s 0.031
*** 0.037
*** 0.021
*** 0.027
***
decade '00s 0.064
*** 0.071
*** 0.025
*** 0.046
*** 0.029
*** 0.027
*** 0.001
0.023
***
Observations 53,401
53,401
53,401
52,331
37,603
37,603
37,603
36,847
R2
0.181
0.189
Adjusted R2
0.180
0.188
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Notes: Models (1) to (4) present the results of three-decade models from 1980 to 2010 and models (5) to (8)
are two-decade models from 1990 to 2010. The first three models of each study period present quantile
regression estimates at the 25th, 50th, and 75th percentiles, respectively. The specifications of all models in
Table 4 are the same as in models (2) and (6) in Table 3 although the results for control variables are not
shown here for brevity.
TABLE 5. Heterogeneity in Young (25-34) Adult’s Preference for Consumption
Amenities
1990s 2000s
25th 50th 75th 25th 50th 75th
Baltimore 0.025 -0.047 0.024 -0.019 -0.004 0.027
Boston -0.030 -0.005 -0.019 0.011 0.035 0.020
New York 0.016 0.027 0.092 -0.024 -0.010 0.005
Philadelphia 0.000 0.014 0.022 0.008 0.016 0.031
Washington, DC 0.011 0.012 0.035 -0.041 -0.006 0.048
Chicago -0.026 0.013 0.004 -0.037 -0.013 0.013
Cleveland -0.008 0.033 0.045 0.018 0.029 0.074
Detroit 0.027 0.026 0.053 0.032 0.006 -0.008
Minneapolis -0.007 0.007 0.093 -0.012 0.027 0.059
St. Louis -0.037 -0.050 -0.095 -0.038 0.001 -0.014
Atlanta 0.058 0.023 -0.005 -0.011 0.014 0.022
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Dallas 0.057 0.076 0.031 -0.011 0.006 -0.049
Houston 0.031 0.019 0.043 -0.025 -0.007 0.048
Miami -0.031 -0.033 -0.080 0.042 0.053 0.036
Tampa 0.016 0.026 -0.046 0.023 0.064 0.008
Los Angeles 0.004 0.020 0.030 0.018 0.033 0.058
Phoenix -0.022 -0.013 -0.016 -0.082 -0.054 -0.061
San Diego -0.110 -0.027 0.014 0.014 0.035 0.087
San Francisco -0.030 -0.016 0.080 0.070 0.063 0.068
Seattle -0.022 0.002 0.063 0.050 0.028 0.086
Notes: The table presents the coefficients of consumption amenities on the net migration of Young (25-34)
cohort from 120 quantile regression models (20 UA × three quantile points × two decades). The net
migration is standardized by UA and decade to help compare coefficients across models. The same set of
control variables as those in Model (6) in Table 3 are included but not shown for brevity. Colored cells
indicate statistically significant coefficients at least at p=0.1: darker red indicates significant at p<0.01 and
negative in sign, and darker green indicates significant at p<0.01 and positive in sign.
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1980s 1990s 2000s
a) Youngest (20-24)
1980s 1990s 2000s
b) Young (25-34)
1980s 1990s 2000s
c) Midlife (35-44)
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1980s 1990s 2000s
d) Middle Age (45-64)
FIGURE 1. Net Migration Patterns of Four Adult Cohorts in the Washington, DC
Urbanized Area, Notes: All maps present the percent net-migration (Number of net-migration/cohort
population in the beginning year) of the corresponding population cohort in each decade.
1980-1990 1990-2000 2000-2010
a) Youngest (20-24)
1980-1990 1990-2000 2000-2010
b) Young (25-34)
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1980-1990 1990-2000 2000-2010
c) Midlife (35-44)
1980-1990 1990-2000 2000-2010
d) Middle age (45-64)
FIGURE 2. Percent Net-Migration by the Distance from the CBD, 1980-2010, Notes: The
above lines are created from spline regression of percent net-migration on distance from the CBD by
Census Region. The data exclude outlierstop 2.5% and bottom 2.5%and were pooled by Census
Region.
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Appendix
TABLE A1. Exploratory Factor Analysis Result for Neighborhood Characteristics
Density Access
to public
transit
Central
location
Final
communality
estimates
ln(street density) a 0.75
5 0.12
8 0.24
1 0.645
ln(population density) a 0.75
0 0.18
5 0.27
4 0.671
Half mile from the nearest transit facility b 0.17
1 0.66
3 0.24
3 0.528
1/(the distance to the nearest transit facility)
0.10
1 0.63
9 0.14
3 0.439
Census tract in the central city boundary b 0.31
1 0.31
8 0.59
9 0.556
ln(the distance to the CBD) a -
0.427 -
0.273 -
0.595 0.611
Variance explained by each factor 1.45
1 1.07
4 0.92
5
Notes: a indicates that variables are standardized by UA and decade before the exploratory factor analysis
(EFA), and b indicates binary variables. Because of data availability, EFA is conducted for the two
decades, 1990-2010. As for the rotation method, varimax is used to make the three factors orthogonal to
one another.
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TABLE A2. Summary Statistics of Key Variables
Variable names
1980's 1990's 2000's
mea
n s.d. min med
ian max mea
n s.d. min med
ian max mea
n s.d. min med
ian max
Net migration, 20-24
(count)a 33 414 -
2,0
44 -16 7,78
3 69 398 -
4,88
0 7 10,9
17 38 375 -
5,01
5 -12 6,95
2
Net migration, 25-34
(count)a 106 615 -
8,8
52 42 13,6
85 80 551 -
11,2
05 36 21,1
96 73 482 -
11,3
01 56 11,2
55
Net migration, 35-44
(count)a -1 303 -
3,5
92 -21 5,75
8 -4 408 -
2,38
1 -25 18,8
25 -74 307 -
2,82
2 -62 11,4
34
Net migration, 45-64
(count)a -67 243 -
2,1
62 -83 6,21
9 -37 287 -
1,13
0 -53 13,1
48 -39 248 -
1,90
5 -55 9,07
4
Distance to CBD
(mile) 13.3 10.5 0.0 10.3 83.6 13.4 9.8 0.0 10.8 79.9 14.4 10.8 0.0 11.5 81.1
Within the political
boundary 0.41 0.49 0.0
0 0.00 1.00 0.38 0.49 0.00 0.00 1.00 0.36 0.48 0.00 0.00 1.00
In 3 miles from CBD
(mile) 0.09 0.28 0.0
0 0.00 1.00 0.09 0.28 0.00 0.00 1.00 0.08 0.27 0.00 0.00 1.00
In 5 miles from CBD
(mile) 0.19 0.39 0.0
0 0.00 1.00 0.18 0.39 0.00 0.00 1.00 0.17 0.37 0.00 0.00 1.00
Population density (per
acre) 20.5 69.0 0.0 10.3 7,86
6.8 19.2 30.8 0.0 9.3 1,07
6.5 19.5 30.3 0.0 9.2 359.
0
1/(distance to nearest
transit) 0.6 2.0 0.0 0.0 119.
9 1.0 3.2 0.0 0.1 180.
5 1.0 3.0 0.0 0.2 180.
5
Factor score: central
cityb - - - - - 0.01 0.68 -
3.13 -
0.24 2.45 -
0.01 0.66 -
3.18 -
0.24 2.42
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Factor score:
population densityb - - - - - 0.00 0.81 -
5.09 0.16 4.12 0.00 0.82 -
4.21 0.13 3.30
Factor score: access to
transitb - - - - - 0.00 0.75 -
0.74 -
0.26 23.4
5 0.00 0.73 -
0.80 -
0.26 23.4
2
Consumption job
density (per acre) - - - - - 1.48 6.23 0.00 0.51 315.
80 1.33 6.48 0.00 0.40 270.
24
Population size 4,35
6 2,44
0 37 3,96
9 39,4
28 4,39
5 2,63
8 0 4,01
0 71,8
94 4,42
7 2,22
8 0 4,16
2 34,0
55
% 20-24 in the
beginning year 9.3
% 3.7
% 0.0
% 8.9
% 59.5
% 7.9
% 4.1
% 0.0
% 7.3
% 65.8
% 6.7
% 4.1
% 0.0
% 6.2
% 80.0
%
% 25-34 in the
beginning year 16.8
% 5.2
% 0.0
% 15.9
% 53.1
% 18.6
% 6.0
% 0.0
% 18.1
% 100.
0% 15.7
% 6.1
% 0.0
% 14.9
% 100.
0%
% 35-44 in the
beginning year 11.5
% 2.9
% 0.1
% 11.0
% 26.9
% 15.2
% 3.8
% 0.0
% 14.9
% 100.
0% 16.2
% 3.3
% 0.0
% 16.2
% 99.9
%
% 45-64 in the
beginning year 20.9
% 5.6
% 0.2
% 20.8
% 57.7
% 18.8
% 5.6
% 0.0
% 18.5
% 66.7
% 21.4
% 5.7
% 0.0
% 21.2
% 99.9
%
% Non-Hispanic
White 68.4
% 34.0
% 0.0
% 85.7
% 100.
0% 61.6
% 34.6
% 0.0
% 76.2
% 100.
0% 53.2
% 33.8
% 0.0
% 61.5
% 100.
0%
% Foreign born 12.2
% 11.8
% 0.0
% 8.4
% 85.7
% 14.9
% 14.8
% 0.0
% 9.8
% 100.
0% 20.0
% 16.9
% 0.0
% 14.8
% 100.
0%
% Professionals 11.3
% 7.7
% 0.0
% 9.7
% 67.3
% 14.4
% 9.9
% 0.0
% 12.9
% 100.
0% 17.1
% 10.7
% 0.0
% 15.6
% 100.
0%
Median household
income ($) 19,2
46 8,46
7 2,5
00 18,3
60 75,0
00 36,4
12 18,2
88 0 34,3
59 150,
001 50,2
52 25,0
45 0 46,1
31 200,
001
% Unemployed 7.1
% 5.3
% 0.0
% 5.6
% 45.5
% 7.6
% 6.9
% 0.0
% 5.4
% 100.
0% 7.2
% 6.9
% 0.0
% 5.0
% 100.
0%
% Multifamily
housing units 43.5
% 32.0
% 0.0
% 36.8
% 100.
0% 40.6
% 32.0
% 0.0
% 33.6
% 100.
0% 39.4
% 31.4
% 0.0
% 32.4
% 100.
0%
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a: Net migration counts are computed for the ten year period in each decade while all other variables show
the values for beginning years.
TABLE A3. Spatial Regression of the Net Migration of Four Adult Cohorts
(A) Spatial lag models
With urbanism variables With urbanism factors
Youngest
(20-24)
Young
(25-34)
Midlife
(35-44)
Middle
(45-64)
Youngest
(20-24)
Young
(25-34)
Midlife
(35-44)
Middle
(45-64)
Central city '80s -0.003
0.066
*** 0.024
-0.051
***
Central city '90s 0.033
** 0.114
*** 0.014
-0.079
***
Central city '00s 0.119
*** 0.173
*** 0.013
-0.024
Central city '90s (factor score)
0.010
0.074
*** 0.014
0.054
***
Central city '00s (factor score)
0.055
*** 0.055
*** 0.055
*** 0.033
***
Population density '80s -0.073
*** -0.176
*** -0.213
*** -0.272
***
Population density '90s 0.021
*** -0.060
*** -0.286
*** -0.181
***
Population density '00s -0.004
-0.089
*** -0.228
*** -0.258
***
Population density '90s (factor score)
-0.001
-0.068
*** -0.262
*** -0.188
***
Population density '00s (factor score)
-0.011
** -0.069
*** -0.221
*** -0.264
***
Access to transit '80s 0.007
*** 0.020
*** 0.018
*** 0.014
***
Access to transit '90s 0.000
0.012
*** 0.005
*** 0.004
**
Access to transit '00s 0.003
** 0.012
*** 0.009
*** 0.012
***
Access to transit '90s (factor score)
-0.006
0.076
*** -0.005
-0.008
Access to transit '00s (factor score)
-0.007
0.060
*** 0.031
*** 0.020
**
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Consumption amenity '90s
0.041
*** -0.006
-0.042
*** -0.024
***
Consumption amenity '00s
0.086
*** 0.040
*** -0.048
*** 0.015
**
* Goodness of fit measure: the squared covariance of the actual and predicted net migration
1980s 0.463
0.188
0.177
0.182
1990s 0.432
0.185
0.351
0.108
0.433
0.190
0.334
0.105
2000s 0.465
0.208
0.349
0.161
0.474
0.205
0.346
0.153
(B) Spatial error models
With urbanism variables With urbanism factors
Youngest
(20-24)
Young
(25-34)
Midlife
(35-44)
Middle
(45-64)
Youngest
(20-24)
Young
(25-34)
Midlife
(35-44)
Middle
(45-64)
Central city '80s -0.002
0.065
*** 0.029
* -0.051
***
Central city '90s 0.032
** 0.115
*** 0.021
-0.076
***
Central city '00s 0.119
*** 0.173
*** 0.014
-0.025
Central city '90s (factor score)
0.010
0.075
*** 0.019
** 0.053
***
Central city '00s (factor score)
0.055
*** 0.054
*** 0.056
*** 0.032
***
Population density '80s -0.072
*** -0.178
*** -0.214
*** -0.273
***
Population density '90s 0.022
*** -0.060
*** -0.285
*** -0.183
***
Population density '00s -0.004
-0.091
*** -0.227
*** -0.260
***
Population density '90s (factor score)
0.000
-0.067
*** -0.263
*** -0.190
***
Population density '00s (factor score)
-0.011
** -0.070
*** -0.220
*** -0.266
***
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Access to transit '80s 0.007
*** 0.019
*** 0.016
*** 0.013
***
Access to transit '90s 0.000
0.012
*** 0.005
*** 0.004
**
Access to transit '00s 0.003
** 0.012
*** 0.009
*** 0.011
***
Access to transit '90s (factor score)
-0.005
0.076
*** -0.009
-0.008
Access to transit '00s (factor score)
-0.007
0.059
*** 0.031
*** 0.020
**
Consumption amenity '90s
0.041
*** -0.005
-0.041
*** -0.022
***
Consumption amenity '00s
0.086
*** 0.041
*** -0.047
*** 0.015
**
* Goodness of fit measure: the squared covariance of the actual and predicted net migration
1980s 0.461
0.186
0.182
0.181
1990s 0.431
0.178
0.356
0.108
0.433
0.184
0.339
0.103
2000s 0.465
0.205
0.350
0.159
0.474
0.201
0.347
0.150
Notes: Spatial models are run for each decade separately though they are presented in the same way as the pooled non-
spatial models in Table 3 so that they are more comparable. The results for other control variables are not shown here
for brevity. As a goodness of fit measure, the squared covariance of the actual and model-predicted net migration is
computed, which is an equivalent to the R squared of the OLS regression.
TABLE A4. Spatial Quantile Regression of the Net Migration of Young (25-34)
Cohort
With urbanism variables With urbanism factors
25th 50th 75th Spatial lag Spatial error 25th 50th 75th Spatial lag Spatial error
Central city '80s 0.018
* 0.042
*** 0.054
*** 0.066
*** 0.065
***
Central city '90s 0.040
*** 0.070
*** 0.097
*** 0.114
*** 0.115
***
Central city '00s 0.074
*** 0.096
*** 0.149
*** 0.173
*** 0.173
***
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Central city '90s*
0.042
*** 0.046
*** 0.054
*** 0.074
*** 0.075
***
Central city '00s*
0.021
*** 0.033
*** 0.052
*** 0.055
*** 0.054
***
Population density '80s -0.056
*** -0.122
*** -0.244
*** -0.176
*** -0.178
***
Population density '90s 0.010
* -0.040
*** -0.129
*** -0.060
*** -0.060
***
Population density '00s -0.016
*** -0.056
*** -0.117
*** -0.089
*** -0.091
***
Population density '90s*
0.028
*** -0.035
*** -0.149
*** -0.068
*** -0.067
***
Population density '00s*
0.020
*** -0.037
*** -0.101
*** -0.069
*** -0.070
***
Access to transit '80s 0.009
** 0.022
*** 0.041
*** 0.020
*** 0.019
***
Access to transit '90s 0.008
*** 0.014
*** 0.029
*** 0.012
*** 0.012
***
Access to transit '00s 0.006
*** 0.011
*** 0.024
*** 0.012
*** 0.012
***
Access to transit '90s*
0.055
*** 0.058
*** 0.072
*** 0.076
*** 0.076
***
Access to transit '00s*
0.040
*** 0.041
*** 0.060
*** 0.060
*** 0.059
***
Consumption amenity '90s
-0.025
*** -0.004
0.002
-0.006
-0.005
Consumption amenity '00s
-0.001
0.021
*** 0.040
*** 0.040
*** 0.041
***
* Goodness of fit measure: the squared covariance of the actual and predicted net mi gration
1980s
0.188
0.186
1990s
0.185
0.178
0.190
0.184
2000s
0.208
0.205
0.205
0.201
Notes: Spatial models are run for each decade separately. The statistical software employed for the estimation of spatial
quantile regression, the qregspiv command of the McSpatial package in R, does not return goodness-of-fit measures.
Also, note that the spatial lag and error models above are borrowed from Table A3 for comparison.
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Accepted Article
TABLE A5. Robustness Check under Alternative Definitions for the Central City Census
Tracts
Definition of Central City
Three-decade models
Youngest
(20-24)
Young
(25-34)
Midlife
(35-44)
Middle
(45-64)
The largest city
1980s 0.052
*** 0.043 *** 0.186 *** 0.219 ***
1990s 0.019 * 0.124 *** 0.042 *** 0.146 ***
2000s 0.085 *** 0.069 *** 0.116 *** 0.072 ***
3 miles from CBD
1980s 0.022 0.102 *** 0.115 *** 0.066 ***
1990s 0.013 0.143 *** -0.017 -0.119 ***
2000s 0.161 *** 0.263 *** 0.029
-0.067 ***
5 miles from CBD
1980s 0.025 ** 0.078 *** 0.111 *** 0.065 ***
1990s 0.031 *** 0.123 *** -0.047 *** -0.085 ***
2000s 0.130 *** 0.175 *** 0.027 ** -0.088 ***
10 miles from CBD
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Accepted Article
1980s 0.023 ** 0.004
0.124 *** 0.099 ***
1990s 0.034 *** 0.094 *** -0.055 *** 0.034 ***
2000s 0.062 *** 0.050 *** 0.053 *** -0.040 ***
Notes: The table presents the coefficients of central city binary indicators from four OLS models for each
age group, each with an alternative central city definition. Model specifications are the same as those in
Table 3.
A) % change in population, age group 20-29 B) % change in the total population
C) % net migration of older Millennials (20-29) D) Consumption amenities index
FIGURE A1. Net Migration Patterns vs. Population Changes in the Washington, DC
Urbanized Area, 2000-2010, Notes: The tone of colors in each panel indicates the decile of individual
tracts regarding the four measures: the darkest denotes the top decile, and the lightest denotes the bottom
decile. Panels A) and B) show simple population changes (%) of age group 20-29 and the total population,
respectively. In comparison, Panel C) presents percent net-migration patterns of the birth cohort who grew
up to be 20 to 29 years old in 2010. Panel D) maps the consumption amenities index, which is estimated via
a factor analysis of the densities of amenities-related businesses including cafes, restaurants, bars, and night
clubs.
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... Over the past three decades, there has been marked increase in demand for transit-oriented, amenity-rich, and walkable central city neighborhoods in many North American cities (Frank et al., 2015;Lee et al., 2019;Wang et al., 2024). There are likely numerous interconnected economic, demographic, and cultural reasons for this trend including declining family sizes, rising education, falling crime rates, economic restructuring, and neoliberal policies that support gentrification (e.g., formation of development corporations, property-based tax incentives, place branding and marketing, etc.), and changing preferences among younger generations (Ehrenhalt, 2013;MacLeod, 2014;Hyra, 2015;Schwartz, 2015;Lee et al., 2019). ...
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