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DEVELOPMENT ECONOMICS | RESEARCH ARTICLE
Monetary policy effectiveness in the advent of
mobile money activity: Empirical evidence from
Ghana
Emmanuel Agyapong Wiafe
1
*, Christopher Quaidoo
2
and Samuel Sekyi
3
Abstract: Financial development impacts a country’s economic growth and devel-
opment. Due to this, many nations have sought new ways to bring about financial
sector development. For developing economies, innovations in the financial sector
are a sure bet for the development of financial inclusion. Mobile money is one of
them. However, as the financial sector innovate, the Central Bank may lose control,
rendering monetary policy ineffective. Therefore, this study examines one such
innovation’s effect on monetary policy effectiveness. Using SVAR and monthly data
spanning from January 2012 to December 2018, the study found that monetary
policy becomes less effective under mobile money growth. The study further
revealed that policy rates respond to mobile money growth in Ghana. In conducting
monetary policy in Ghana, the study recommends that the monetary policy
authority includes mobile money activity.
Subjects: Economics; Macroeconomics; Monetary Economics; Development Economics
ABOUT THE AUTHORS
Emmanuel Agyapong Wiafe a Lecturer at the
Department of Economics, School of Liberal Arts
and Social Sciences, Ghana Institute of
Management and Public Administration (GIMPA),
Achimota, Ghana. His main areas of expertise
are development economics, applied econo-
metrics and macroeconomic issues for develop-
ing countries. The current research on mobile
money aligns with the researcher’s works on
impact of interoperability payment, mobile pay-
ment systems macroeconomic developments.
Samuel Sekyi is a Senior Lecturer of
Economics at SD Dombo University of Business
and Integrated Development Studies, Ghana. His
main areas of expertise and interest are in the
fields of Microeconometrics, health economics,
development economics, agricultural economics
and finance.
Christopher Quaidoo, is a Lecturer at the
Department of Banking and Finance, University
of Professional Studies, Accra, Ghana. His main
research interests are in the fields of corporate
finance, monetary economics and development
economics.
PUBLIC INTEREST STATEMENT
Over the past decades, mobile money usage and
other technologies that facilitate financial trans-
actions have flooded developing economies, of
which Ghana is not an exception. These fintechs
have led to the provision of financial services like
savings, insurance, access to credit among others,
especially for the poor and financially excluded
from the formal banking system. These develop-
ments will have implications for the monetary
policy of the central bank. To this end, the study
focused on the effect of mobile money on the
effectiveness of monetary policy. The results from
the study suggest that, mobile money activities in
Ghana affect the conduct of monetary policy in
Ghana. Thus, monetary policy becomes less
effective when money experiences growth in the
value of transactions. Therefore, the monetary
authority must take a closer look at the mobile
money activities and accommodate them in the
framing of monetary policy for Ghana.
Wiafe et al., Cogent Economics & Finance (2022), 10: 2039343
https://doi.org/10.1080/23322039.2022.2039343
Page 1 of 15
Received: 11 November 2021
Accepted: 31 January 2022
*Corresponding author: Emmanuel
Agyapong Wiafe, School of Liberal
Arts and Social Sciences, Ghana
Institute of Management and Public
Administration (GIMPA)
E-mail: ewiafe@gimpa.edu.gh
Reviewing editor:
Miao Wang, Marquette University,
UNITED STATES
Additional information is available at
the end of the article
© 2022 The Author(s). This open access article is distributed under a Creative Commons
Attribution (CC-BY) 4.0 license.
Keywords: Mobile money; monetary policy effectiveness; monetary policy; output;
inflation; SVAR
1. Introduction
The surge in financial innovations is expected to impact developing economies. These innovations are
touted to improve financial inclusion and ensure the allocative efficiency of resources (Bernier & Plouffe,
2019; Frame & White, 2014; Lumsden, 2018). Thus, a large percentage of the unbanked (Demirgüç-Kunt
& Klapper., 2013) would have financial services access. The expanded access through financial innova-
tions would have implications for the conduct of monetary policy by the central banks. Theories on
financial innovation and development suggest contrasting positions of which one stand supports the
argument that financial innovation strengthens the interest rate channel of monetary policy transmis-
sion (Noyer, 2007). On the other hand, it could pose a challenge to the conduct of monetary policy.
Financial innovations are well advanced in Africa, leading to mobile money services develop-
ment in the fintech landscape. Across the region, mobile transfer, mobile payments, and mobile
financial transactions have gain dominance (Orekoya, 2017). Mobile money services have received
a boost due to the development of mobile telecommunication services (Nyamongo & n.d.irangu,
2013). Financial services have reached millions due to mobile money services and are used widely
for financial transactions in Ghana. Available data reveals that at the end of 2017, mobile money
subscribers in Ghana were 23,947,437 out of 37,445,048 mobile phone subscribers. The figures
indicated a whopping 83.1% of the total population owns mobile money accounts (Boateng, 2018).
As of June 2021, the value of transactions done through mobile money was GHS 89.1 billion,
a 96.6% increase over the same period in 2020 (BoG, 2021).
The increasing use of mobile money as a means of payment services reduce poverty, boost
economic activity, provide savings opportunities and the ability to participate in the financial sector
of an economy (Adaba et al., 2019; Asamoah et al., 2020; Boateng, 2018). These benefits notwith-
standing, there are unanswered questions about the impact of mobile money on the effectiveness
and conduct of monetary policy in Ghana. Mawejje and Lakuma (2019), citing Tumusiime-Mutebile
(2015), asserted that mobile money might negatively affect the effectiveness of monetary policy
through the interest rate channels. Simpasa et al. (2011) raised concerns about the potential infla-
tionary effect of mobile money in developing countries. They argued that an increase in the velocity of
money due to mobile money could undermine monetary policy effectiveness and lead to price
instability. The evidence is that mobile money has a moderate effect on monetary aggregates
(Mawejje & Lakuma, 2019), indicating the possibility of its impact on monetary policy. Aron et al.
(2015) and Adam and Walker (2015) found no concrete evidence supporting the inflationary effect of
mobile money. The argument for and against the impact of mobile money activity on monetary policy
is inconclusive. To the best of our knowledge, there is no research conducted on the impact of mobile
money on the effectiveness of monetary policy in Ghana. Therefore, this study seeks to answer the
question; what is the influence of mobile money on monetary policy effectiveness in Ghana?
Except for Orekoya (2017), who focused solely on Nigeria, studies on the influence of mobile
money on macroeconomic variables have primarily concentrated on Eastern African economies.
Studies like Aron et al. (2015) and Mawejje and Lakuma (2019) could not apply to the Ghanaian
economy because they were conducted in monetary targeting economies. Given the mobile money
growth in Ghana under the inflation targeting regime, an examination of its role in the efficacy of
monetary policy cannot be downplayed. To the best of our knowledge, Ghana has not seen any
study that has attempted to examine the impact of monetary policy conduct with the hindsight of
considering mobile money. Studies on mobile money in Ghana have centred on financial inclusion,
poverty reduction and employment. We examine the relationship between mobile money and
monetary policy effectiveness in an inflation-targeting framework.
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The rest of the paper is organised as follows: the next section presents the pattern and trends of
the mobile money landscape in Ghana, linkages between monetary policy and mobile money,
including the empirical literature. The third section deliberates on the methodology employed. We
then discuss the results of the study in section four. The last section presents the conclusion and
policy recommendations/implications of the study.
2. Literature
2.1. Mobile money in Ghana
Mobile money activities started in 2009 in Ghana with just one mobile operator. However, the
acceptance of mobile money was slow compared with Eastern African countries like Malawi and
Kenya (Mattern, 2018). This situation was due to regulation bottlenecks but was later addressed.
According to IMARC Group (2019), mobile money services have witnessed growth due to the
advantage of their convenience, the availability of agents and the interoperability introduced in
the early part of 2019. Aside from this, the Bank of Ghana’s action to ease the operating environ-
ment has fostered growth in this sector’s activities (Boateng, 2018; Mattern, 2018).
Data available suggests a growth in the number of subscribers to mobile money with/and
a corresponding increase in the volume of transactions conducted using mobile money platforms.
Cumulatively, the total number of registered mobile money accounts went from 3,778,374 to
32,554,346 accounts (Bank of Ghana, 2019). This number represents a growth of over 300% in
mobile money accounts. According to the Bank of Ghana as cited in Boateng (2018), 83.1% of
Ghanaians had a mobile money account in 2017.
From Figure 1, observation reveals that the number of active accounts has also increased over
the years. This increase corresponds to the rising values and the number of transactions recorded
over the years. Trends suggest the value of transactions has seen an upward trend from
594.12 million Ghana Cedis in 2012 to about 66 billion in the first quarter of 2019. Expectations
are that this figure will grow by 26.75% of the 2018 value of transactions over mobile money.
These figures and the volume of business transacted over mobile money keeps growing and will
present a growing concern for the Bank of Ghana and other regulators of cyberspace.
2.2. Monetary policy and mobile money
From the trends and growth of the monetary values of the volumes of transactions done through
mobile money, it is fundamentally significant to assess its possible effect on the conduct of
monetary policy in Ghana. The monetary policy goals for the Bank of Ghana include price stability
and stable economic growth. Generally, the quantity of money theorists frames the likelihood for
mobile money to lead to inflationary pressures (Adam & Walker, 2015; Aron et al., 2015).
According to Simpasa et al. (2011), there is the possibility of mobile money being a driver of
high inflation levels. The import of such an argument rested on the likelihood of mobile money
leading to monetary expansion. Again, the inflationary pressure from such innovations may result
0
50,00,000
1,00,00,000
1,50,00,000
2,00,00,000
2,50,00,000
3,00,00,000
3,50,00,000
2012 2013 2014 2015 2016 2017 2018
Registered mobile money
accounts
Active acounts
Figure 1. Registered (cumula-
tive) and active mobile
accounts.
Source: Bank of Ghana
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from consumers’ ability to transact business easily, increasing the velocity of money. Still, mobile
money could propel productivity and investment by firms (Islam et al., 2018). This condition
happens through a reduction in the cost of the transaction. Such ease of money transfer does
provide liquidity to the firms leading to improved cash flow and investment. By this, firms will seek
to advance and pursue growth yielding opportunities by investing their funds. If firms follow such
a course, it leads to allocative efficiency and reduction in the general price levels. The argument for
mobile money affecting the money demand has two arms. The first strand argues that mobile
money may accumulate e-money which hitherto was not so. These holdings by households would
tend to affect the demand for money. This state implies mobile money will correlation positively
with monetary aggregates (Mehrotra & Yetman, 2015; Yetman, 2017). The second stance posits an
increase in transactional efficiency that emanates from innovations in the financial sector of which
mobile money is part. Thus, mobile money tends to reduce the risk of losses due to handling cash.
Similarly, mobile money reduces the cost of transacting business and removes business bottle-
necks, dealing with a financial institution such as waiting time and locational disadvantages of
banks. In such scenarios, the demand for money may reduce (Mawejje & Lakuma, 2019;
Nyamongo & n.d.irangu, 2013).
Demand for money and supply of private sector credits are argued to be channelled through
which mobile money could affect monetary policy effectiveness in an economy. On one breath, if
mobile money results in inflationary pressures, then monetary authorities might respond by
pursuing tight monetary policies leading to high interest rates. Besides, mobile money can affect
the private sector credit. Essentially, mobile money deposits held in financial institutions’ escrow
accounts can be turned into loanable funds by financial institutions, thereby increasing funds
available for credit creation. Nampewo et al. (2016) found that mobile money had emerged as
a significant determinant of private sector credit growth in Uganda through its crucial role in
savings and deposit mobilization. Finally, mobile money leads to economic efficiency through
reduced transaction costs, better resource allocation and credit, supporting aggregate economic
activity. In this regard, there is emerging evidence linking mobile money use to increased firm-level
investments (Islam et al., 2018), agricultural (Aker & Mbiti, 2010; Sekabira & Qaim, 2017), risk-
sharing (Mawejje & Lakuma, 2019; Riley, 2018), and financial-sector development (Munyegera &
Matsumoto, 2018). These effects will likely have positive implications for economic growth).
Concerning the potential relationship between mobile money and inflation, there are two
alternative views. Mobile money could prove to be inflationary if it affects the velocity of money
in circulation without necessarily improving the levels of aggregate output. Simpasa et al., 2011),
for example, espouse this viewpoint. However, there could be countervailing effects where mobile
money improves productivity and economic efficiency, lower transaction costs and higher output,
resulting in a lesser or non-existent inflationary effect (Aron et al., 2015).
3. Methodology
3.1. Econometric strategy
The study adopted the New Keynesian model used by Ahiakpor et al. (2019) and Aron et al. (2015)
to assess the effect of mobile money on monetary policy effectiveness. The output model in the
study is based on the Keynesian IS model and is given as:
yt¼ ;0þ ;1yt1 ;2SRtπtþ1
ð Þ þ ϕ3ERtþP�
tPt
�þυt(1)
It must be noted that, output gap is measures as potential output (Y�
t) less actual output (Yt). The
;i s are coefficients that capture the impact of the respective variables on the output gap. The
output gap, short term interest rate, inflation rate, nominal exchange rate, foreign and domestic
price levels are represented by yt, SRt, INFt, ERt, P�
t, and Pt respectively. υt is a random walk error
term that is assumed to be white noise. Equation one (1) is re-specified as:
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yt¼f yt1;SRt;INFt;ERt
ð Þ (2)
Equation two (2) presents the output gap as a function of short-term interest rate, inflation rate and
real exchange rate (Where the real exchange rate is the nominal exchange rate adjusted for inflation).
The study adopts Calvo’s (1983) nominal price adjusting models as cited in Ahiakpor et al. (2019)
to model the monetary policy impact on inflation in the following manner:
πt¼φtπt1þφ2ytþφ3yt1þφ4ERtþP�
tPt
�þφ5ERt1þP�
t1Pt1
�þ 2t(3)
By implication, the output cap, real interest rate and past inflation outcomes influence inflation.
Thus, equation three (3) can be written as:
INFt¼f INFt1;yt;ERt
ð Þ (4)
For this study’s objective and following the empirical works of Aron et al. (2015), Mawejje and
Lakuma (2019) Mehrotra and Yetman (2015), the above models 2 and 4 are augmented to include
mobile money (MOMO), short term interest rate (SR) and interaction between the short-term
interest rate and mobile money (MSR), financial inclusion (FI) and the interaction of mobile
money,), the exchange rate (ER) and claims on private sector (PSC).
yt¼f yt1;SRt;INFt;ER;t;MOMOt;M2t;MSRt;FI;PSCt
� (5)
INFt¼f INFt1;yt;MOMOt;M2t;SRtMSRt;ERt;FIt;PSCt
ð Þ (6)
3.2. Data, variables, and measurement
The data used for the study were monthly data from the year 2012 January to December 2018. This
data gives about 84 observations, enough to estimate a Vector Autoregressive model. Data availability
influenced the choice for this period. Also, the start date coincides with the period where mobile
money experienced rapid penetration and caught attention due to the Bank of Ghana policy reforms.
The output is proxied in this study by the Bank of Ghana’s Composite Index of Economic Activity (CIEA;
see: Ahiakpor et al., 2019), providing monthly information on the country’s economic productivity. The
Bank of Ghana provided the value of mobile money transactions. This data was later converted into
monthly data series using EVIEWS. The cubic spline method was used to interpolate the annual data to
monthly data base on the structure of CIEA. The quadratic sum approach to interpolate the data from
yearly to monthly data series since it provides an efficient and simple approach to data transformation
from low frequency to high frequency data. Though there may be a problem of non-negativity in the
data, this was solved by taking the natural log of the data used for the study. For mobile money, we
used the values rather than the volume of transactions made since the value of the transactions made
will have much more effect on the total money supply. We obtained the monthly series of inflation
rates from the Bank of Ghana. The IMF’s Global Economic Monitor dataset website provided the
monthly bilateral exchange rate. The study used the Ghana Cedi to Dollar bilateral exchange rate.
We obtained the monetary policy rate from the Bank of Ghana. Ghana uses policy rate as the key
monetary policy instrument to signal the Bank’s monetary policy stance. Financial inclusion was
measured using the number of bank branches available per 1000 people. We believe that the innova-
tion in the provision of financial services like mobile money results in financial inclusion. Hence mobile
money could affect monetary policy through its effect on financial inclusion. We estimated the output
gap (yt) using the Hodrick-Prescott (HP) filter (λ = 1400 as recommended for monthly series) to obtain
a time-varying trend. Monthly series is preferred because it is easier to identify trends changes and
better for long-term strategic forecasting.
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3.3. Structural VAR model
This study employs the structural vector autoregressive (SVAR) model of 9 variables to measure how
inflation and output gaps respond to mobile money, monetary policy and its interaction with
monetary policy. There are two reasons for adopting SVAR for this study instead of other time-
series modelling approaches. Given the objectives of the study, shock to the structural innovation to
study policy response is important. In this case, SVAR offers the more appropriate approach for the
study. Secondly, SVAR offer rooms to examine the contemporaneous effect of variables on the
dependent variable which Vector-Autoregressive Regression are less effective in doing so except
explaining endogenous relationships from past values (See: Pfaff, 2008). It is worth noting that the
VAR’s residuals do not lend themselves to any economic interpretation. However, the SVAR models
typically result from macroeconomic models, and hence restrictions are broadly consistent with
economic theory and outcomes that make economic sense (Brischetto & Voss, 1999). Due to this,
SVAR shocks resulting from unobserved structural forms are meaningful economically. The identifica-
tion restriction of a structural VAR is needed from the variance-covariance matrix of the reduced from
residual. In this manner, the study imposes short-run restriction following an SVAR of the form:
β0Yt¼/ þ ∑
p
i¼p
βiYtiþθμt(7)
From equation seven (7), βi is an nxn parameters matrix for i¼0;1;2;. . . :; p while Yt is nx1 vector
of explained or endogenous variables at time period t, /is a vector of nx1 constant variables and
μt is a vector of nx1 structural shocks that are white noise. Solving equation 7 gives an equivalent
approximation as
Yt¼β0þβ1Yt1þβ2Yt2þ...þβpYtpþεt(8)
Equation 8 is such that εt¼β1
0μt and Eεtε0
t
�¼β1
0θEεtε0
t
�θ0β01
0:For the structural identification
among the parameter to be estimated, the short-run restriction imposed for Bεt¼θμt:In formulating
the identification restrictions for the SVAR, we follow theoretical and empirical studies to arrange the
variable in order of influence. Theoretically, the output gap may cause a change in price levels. For
example, low productivity leads to inflation if demand exceeds the economy’s output levels. Similarly,
the inflationary gap put upward pressure on prices since the monetary value of output produced exceeds
the potential output, creating demand pressures leading to a price increase in practice, the resultant
inflation in the economy will lead to a response in policy rate rise. In cases where the recessionary gap
persists, monetary policy may be reviewed downward to foster investment and boost aggregate
demand. Again, the amount of mobile money holdings will influence the money supply, especially in
cases where mobile money is bank-backed (escrow account holdings). This situation will lead to
a monetary policy response because of mobile money transactions and holdings in the economy.
Such policies affect the money supply through credit channels through their impact on price variations
in the loanable fund. It also follows that mobile money activities result in financial inclusion. Thus,
a shock in mobile money is expected to have a positive impact on financial inclusion and private sector
credit. This event will impact the interest rate and monetary conduct in the economy. There may be
a contemporaneous response of the exchange rate to the policy rate. However, in some cases, the
behaviour of the exchange rate may lead to changes in the policy rate to avert inflationary pressure on
the economy.
Impulse response function (IRFs) was generated to examine the response of the variable of
interest to the structural shocks. This was done for the key variables of interest to the study. Thus,
the IRFs of used for this study focused the response of output gap, inflation and monetary policy to
shocks in mobile money, monetary policy and interaction of monetary policy and mobile money.
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4. Results and discussions
4.1. Preliminary test and summary statistics
Since we are using time-series data, we first examined the time-series properties of the variables.
The study used the Augmented Dickey-Fuller unit root test to scrutinise the stationarity of the
variables. After the variables stationarity property confirmation, we estimated the Structural VAR
(SVAR) model to analyse the effectiveness of monetary policy in Ghana.
Table 1 presents the ADF test results. The results indicate that the log of mobile money and the
interaction between mobile money and short-term interest rate are stationary at levels. However,
all the other variables were non-stationary at levels but became stationary after first differencing.
The Philip-Perron (test) was used to confirm the stationarity of the variables. In cases where the
ADF and PP are stationary at levels, the level variables were used for the VAR estimation. However,
when there were conflicting results, the PP results are used since it is generally considered to be
more robust than the ADF test. The results suggest that all the variables were stationary at first
difference except the log of mobile money for the ADF test. The PP test showed that Output gap,
log of private sector credit, and the interaction of mobile money with short term rate (log of MSR)
were stationary at levels whereas the remaining variables were stationary at first difference.
4.2. Summary statistics
Table 2 presents the summary statistics of the variables used for the study. The mean of inflation
was 13.3, indicating that over the estimation period, Ghana’s monthly inflation levels averaged
13.3 with a standard deviation of 3.2895. The highest level of monthly inflation recorded was
19.2%, and the lowest was 8.64%.
The policy rate for the study period was 19.67 on average, with a 4.089 standard deviation. During
the study period, the lowest monthly rate was 12.5, and the highest monetary policy rate was 26%.
The log of the value of mobile money transactions ranged from 3.539 to 9.888, with a mean of 7.42.
The exchange rate had its highest to be 4.917 and the lowest of 1.6886. However, the average
exchange rate was GHS 3.40 to a dollar. The output gap ranged between −0.17916 and 0.12713.
4.3. Pre-estimation test
Having an appropriate lag length for VAR and SVAR models is imperative. As a result, the appro-
priate lag was determined using the lag length criterion for VAR models. Based on the results, the
number of lags selected by the Schwarz Bayesian Information Criterion (SBIC) suggested a lag
length of 1. The remaining criteria, like the Hannan-Quinn (HQC), indicated two lags, the Final
Prediction Error (FPE) and the Akaike Information Criterion (AIC), all suggested a lag length of 4
(See: Table A2). Based on these results, the study used a lag length of 4. The Lagrange-Multiplier
test for Serial Correlation reveals that we failed to reject the null hypothesis of no autocorrelation
for the lag length used (Table A1), indicating no higher-order serial correlation of the residuals. This
result indicates no higher-order serial correlation of the residuals. The check for stability of the VAR
and SVAR models showed that the SVAR satisfies the stability conditions since the eigenvalues of
the characteristic components lie within the unit circles (See: Figure 1A). The log-likelihood test for
identifying restrict was found to be statistically significant at 5%.
4.4. Responses to mobile money shocks
Figure 2 shows the impulse responses of the output gap, inflation, monetary policy, and money supply to
shocks in mobile money. Observation shows that a shock in mobile money widens the output gap at the
initial stages up to the 5
th
period. The gap, however, begins to close from the 10
th
period, restoring
equilibrium after the 15
th
period. The shocks in mobile money turn to spark off a cyclical behaviour in the
first five periods. It reached a peak after five periods and since then witnessed a steady decline,
approaching equilibrium. This finding indicates that shocks in mobile money may take a very long
time to affect productive activity in the desired way. According to Mawejje and Lakuma (2019), even if
mobile money facilitates easy transactions, it may not result in greater productivity. As a result, the
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output gap is likely to widen. Thus, in the initial stages of adoption, mobile money transaction in Ghana is
mainly for payment and consumption. This situation may result in economic activity expanding beyond
its potential level, as seen in the initial periods of the shocks.
However, the credit facilities offered by mobile money operators can increase investment and
credit access, which enhance productivity and output growth resulting in the output gap reduction.
The results as presented depict these two phases of a shock to the innovation by one standard
deviation. On the other hand, the long-term impact of mobile money resulting in economic
efficiency cannot be over-emphasised. The mobile money landscape has provided businesses in
Ghana with reduced transaction cost. Expectations are that improved resource allocation and
credit activities will allow investment that supports total economic activity. The inference is that
the output gap will narrow in the long term, as seen after the 17th period and beyond. This finding
might be due to firm-level investment reaction to increased mobile money transactions, or it could
be due to direct investment by enterprises made possible by mobile money (Islam et al., 2018).
Also, such response could be attributed in part to developments in the productive sectors like
agriculture, enhanced risk-sharing, greater financial inclusion, which engenders economic growth
and development in any economy (Aker & Mbiti, 2010; Mawejje & Lakuma, 2019; Munyegera &
Matsumoto, 2018; Riley, 2018; Sekabira & Qaim, 2017).
Table 1. Unit root test using ADF
ADF
level
ADF
First difference
PP
level
PP
First difference
Variables tau Lag tau Lag tau Lag Tau lag
SR −1.671 11 −8.580*** 0 −1.738 0 −8.652*** 0
INF −1.798 8 −3.262** 2 −0.518 3 −9.788*** 4
LOG(M2) −0.847 9 −4.765*** 6 −1.676 3 −7.742*** 3
LOG(MOMO) −7.650*** 9 −5.682*** 0 (T) −1.312 10 −4.712***
12(T)
y
t
−1.276 0 −4.704*** 4 −5.903*** 0 −14.780*** 3
ER −1.219 12 −6.122*** 1 −0.826 2 −9.837*** 4
LOGMSR −1.720 8 −3.595*** 0 −4.783*** 3 −3.181** 3
LOGPSC −2.714 2 −13.787*** 0 −3.128*** 3 −13.608*** 5
LOGFI −0.116 4 −5.166 0 0.982 −5.027*** 1
Note: The superscripts “***”, and “**” represents the statistically significant levels of 1% and 5% respectively. (T)
means with trend
Table 2. Summary statistics
Variable N Mean Std. Dev. Min Max
y
t
84 −0.00092 0.0602 −0.1791 0.1271
INF 84 13.3059 3.2895 8.6404 19.2400
SR 84 19.6726 4.0897 12.5 26
LOGM2 84 10.2725 0.4527 9.5231 11.009
LOG(MOMO) 84 7.42600 2.0932 3.5392 9.8880
LOG(MSR) 84 10.3839 2.2446 6.0649 12.7467
ER 84 3.40023 1.0545 1.6886 4.9178
LOG(FI) 84 2.17220 1.000 −1.2051 2.3483
LOG(PSC) 84 10.1891 0.3799 9.3075 10.7295
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A positive shock in mobile money leads to a sharp increase in the inflation rate for the first
months. It immediately follows a downwards trend up to the 9
th
month. However, from the 10
th
to
about the 15
th
month, inflation rises and peaked and begins to fall. This result confirms the earlier
findings of Aron et al. (2015), Adam and Walker (2015) and GSMA (2019), suggesting that the
spread in mobile money may not cause inflationary pressure. Nevertheless, this is true for only the
first few months with it is met with an appropriate shock or response in the monetary policy rate.
This reaction of inflation may be due to the response of short-term interest rates to shocks in
monetary policy. As indicated by Figure 2, monetary policy responds to the shocks in mobile money
with an increase in short-term interest rate in the first month, as mobile money shock affects the
conduct of monetary policy. Thus, monetary policy responds to the initial shocks in mobile money
to improve the effect of mobile money shocks on inflation and output gaps.
Aside from the response of inflation and short-term interest rates, innovations in MOMO induces
an increase in money supply consistent with earlier arguments by Simpasa et al. (2011), Simpasa
et al., 2011), GSMA (s), among others. In this case, the Bank of Ghana may respond to the MM
shock by adjusting the policy rate upwards. Thus, the conduct of monetary policy is influenced by
the activities of mobiles money in the Ghanaian economy.
4.5. Responses to the interaction of MOMO and monetary policy shocks
Figure 3 indicates that a shock to the interaction term of mobile money and monetary policy set
the output gap unto a cyclical path of ups and downs but became stable after 18 months. The
upturns are somewhat short-lived. On average, there seems to be downward pressure on the
output gap, which may be due to the combined effect of monetary policy tightening and positive
shock to mobile money. In other words, the monetary policy tightening moderates the impact of
mobile money on the extent of its influence on the output gap.
Money supply fell in several short periods before rising after the first two periods preceding the
innovation shocks. The climb of the money supply from its descending point after the shock seems
gradual and consistent over the period. The money supply approaches equilibrium in the longer
term. This rise in the money supply may result from the volume and the value of mobile money
transactions conducted outside the banking system through mobile money vendors. There is an
immediate rise in inflation aftershocks to the innovations followed by a drop in inflation. This
behaviour of monthly inflation could be attributed to central bank actions about short term
Figure 2. IRFs of the macroeco-
nomic variables to mobile
money shocks.
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interest rates. Careful observation of the inflation after the shock of the interaction of mobile
money and policy rate shows a rather oscillating behaviour before the inflation variable reaches
equilibrium.
This result is expected given that the policy rate set by Ghana’s central bank influences price
behaviour in the country. The response of the short-term interest rate seems to mimic the inflation
pattern in Figure 3. This finding implies that a rise in inflation may follow a hike in the monetary
policy rate.
4.6. The response of key variables to monetary policy shocks
According to Figure 4, a positive shock to monetary policy does not produce a contemporaneous
effect on output. The output gap widens in the beginning but gradually contract after the sixth
month. We discovered that the output gap oscillates around the equilibrium at a reduced wave in
the estimation horizon. The widening of the output gap is due to an increase in the prices of
loanable funds, leading to a reduction in the amount borrowed for investment purposes. Thus, the
investment rate decreases, leading to a decline in output, causing a rise in the output gap for
successive periods due to monetary policy tightening before reverting to the equilibrium level.
The effect of a contractionary monetary policy also leads to an initial rise in inflation up to
the second month under the estimation horizon. Afterwards, inflation begins to slide down and
somewhat become stable below one standard deviation for ten periods. However, inflation gathers
moment after the 20
th
period and begins to explode. For periods where mobile money is decreasing,
inflation shocks seem to respond appropriately. When mobile money became popular in the 10th
period of the estimating horizon, inflation began to rise. When mobile money operations are present,
this finding suggests a lag effect in the response of inflation to monetary policy action. Thus, mobile
money may delay the impact of monetary policy on monetary aggregates and the output gap. In this
sense, monetary policy in the light of mobile money operation is weak but not outrightly ineffective.
4.7. Counterfactual analysis of the effect of mobile money on monetary policy effectiveness
To perform the counterfactual analysis of the effect of Mobile Money (MOMO) on the effec-
tiveness of the monetary policy, we shut out the mobile money channel as the first step,
leaving the interaction of mobile money and monetary policy. Afterwards, both mobile money
and its interaction term were removed, and the responses of inflation and output gap to
monetary policy shocks were examined. Figures 5 and 6 present these results. The results
indicate that a positive shock in monetary policy rates leads to an initial rise in inflation for
Figure 3. Response of key vari-
ables to shocks in the interac-
tion of MOMO and monetary
policy.
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all three scenarios. In a situation where there is no mobile money influence and the inter-
action term, inflation starts to decline after the 9th period and decline sharply to the 15th
period. Compared with the baseline, the decline in inflation where mobile money effects are
absent (mobile money and its interaction with policy rate), monetary policy seems to be more
effective in reducing inflation levels. This finding may be due to mobile money activities,
which increases money in circulation and the transaction rate leading to demand pressures
that cause prices to rise.
The output gap seems unresponsive in all three scenarios. The cycle in output gap widens in
cases where mobile money activity exists. A careful observation of Figure 6 reveals that over time,
the output gap begins to close. However, given the estimation time horizon, monetary policy is less
likely to influence output levels. As previously stated, the output gap will widen due to the impact
of monetary policy on the price of loanable funds. However, mobile money could make such gaps
explosive in the economy, making the output gap persistent due to a surge in aggregate demand
for the economy. Another explanation is that mobile money provides a means of saving and
investment activity for users, making money available for business transactions. This explanation
would suffice given that Ghana’s economy is mainly informal.
5. Conclusion and policy implication
The study examines the effect of mobile money on monetary policy effectiveness for Ghana. The
core outcomes of monetary policy conduct in this study were output and price stability. The
presence of mobile money activities in the country has implications for the conduct of monetary
policy even under the inflation targeting regime. The result revealed that mobile money shocks
affect the short-term interest rate. Thus, increases in mobile money transactions have
a consequential effect on the monetary policy stance in the economy, which is crucial to price
stability and output in the economy. The results indicate that monetary policy has a slight effect on
inflation and the output of the Ghanaian economy.
It was observed that shocks in mobile money have a slight ability to lead to inflation but
remains stable for a very long time before a decline. And monetary policy may respond to shocks
in the innovations of the money supply. The study discovered that the interaction between
mobile money and monetary policy rate cause a decline in inflation but not immediately.
Similarly, the study found the monetary policy to be effective in reducing inflation in the long
run. However, the counterfactual analysis revealed that in the face of mobile money activity,
Figure 4. Response of key vari-
ables to monetary policy.
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Figure 5. Response of inflation
to monetary.
Figure 6. Response of output
gap to policy monetary policy.
Figure A1. Root of the compa-
nion matrix mod.
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monetary policy becomes less effective in achieving its goal of stabilising prices and closing the
output gap. The implications are clear for policymakers. It is worth noting that in economies
where financial innovations such as mobile money are fast gaining attention, it weakens the
interest rate effect on the money supply in the economy. This outcome explains that financial
innovations provide alternative modes of savings and investments, making money market trans-
actions less attractive.
More so, in an economy like Ghana where informal sector activities dominate, financial innova-
tion that leads to financial inclusion when not regulated and supervised by the Bank of Ghana
could impact monetary policy effectiveness negatively. The reason is that mobile money can make
finance more accessible to both consumers and investors. This situation could cause pricing
pressures, resulting in higher prices and a wider production gap in the economy. Therefore, we
strongly advise the Central Bank of Ghana to carefully assess monetary policy behaviour consider-
ing the Ghanaian economy’s rapid use of mobile money.
Funding
The authors received no direct funding for this research.
Author details
Emmanuel Agyapong Wiafe
1
E-mail: ewiafe@gimpa.edu.gh
ORCID ID: http://orcid.org/0000-0002-7593-7493
Christopher Quaidoo
2
ORCID ID: http://orcid.org/0000-0001-9948-6597
Samuel Sekyi
3
ORCID ID: http://orcid.org/0000-0002-6693-2498
1
Department of Economics, School of Liberal Arts and
Social Sciences, Ghana Institute of Management and
Public Administration (GIMPA) Ghana.
2
Department of Banking and Finance, University of
Professional Studies, Ghana.
3
Department of Economics, Sd Dombo University of
Business and Integrated Development Studies, Wa,
Ghana.
Disclosure statement
No potential conflict of interest was reported by the
author(s).
Citation information
Cite this article as: Monetary policy effectiveness in the
advent of mobile money activity: Empirical evidence from
Ghana, Emmanuel Agyapong Wiafe, Christopher Quaidoo
& Samuel Sekyi, Cogent Economics & Finance (2022), 10:
2039343.
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Appendices
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Table A1. Lagrange-multiplier test
lag chi2 df Prob>Chi2
1 126.136 81 0.001
2 112.513 81 0.012
3 94.392 81 0.147
4 85.680 81 0.340
H0: no autocorrelation at lag order
Table A2. Selection-order criteria
lag LL LR df p FPE AIC HQIC SBIC
1 −770.531 1502.7 81 0 0.809 25.31 26.474 28.2473*
2 −632.311 276.44 81 0 0.169 23.627 25.8383* 29.208
3 −539.046 186.53 81 0 0.16886 23.266 26.525 31.491
4 −441.218 195.66* 81 0 0.164086* 22.7711* 27.078 33.64
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