Humberto Llavador

Pompeu Fabra University | UPF · Department of Economy and Business

The link between income inequality and progressive taxation has long been considered a fundamental normative foundation for income tax progressivity. This paper furnishes necessary and sufficient conditions on primitives, in terms of the elasticity of income with respect to ability, under which various subclasses of progressive taxes are inequality...

The case for progressive income taxation is often based on the classic result of Jakobsson, 1976 and Fellman, 1976, according to which progressive and only progressive income taxes—in the sense of increasing average tax rates on income—ensure a reduction in income inequality. This result has been criticized on the grounds that it ignores the possib...

Classroom experiments as a teaching tool increase understanding and especially motivation. Traditionally, experiments have been run using pen-and-paper or in a computer lab. Pen-and-paper is time and resource consuming. Experiments in the lab require appropriate installations and impede the direct interaction among students. During the last two yea...

The historical evolution of the right to vote offers three observations. First, almost all groups have seen their voting rights challenged at some point in time, and almost all political movements have sought to exclude some other group from voting. Second, reforms towards suffrage extension are varied—from the direct introduction of universal (mal...

Voting and elections play dual roles as social choice systems. On the one hand, they act as a preference aggregation system: they are used to choose between different alternatives when citizens do not agree on their preferred choices. On the other hand, they act as an information aggregation system: when individuals share the same preferences but e...

Human-generated greenhouse gas emissions imperil a global resource: a biosphere capable of supporting life as we know it. What is the fair way to share this scarce resource across present and future generations, and across regions of the world? This study offers a new perspective based on the guiding ethics of sustainability and egalitarianism. Su...

We postulate a two-region world, comprised of North (calibrated after the US) and South (calibrated after China). Our optimization results show the compatibility of the following three desiderata: (1) Global CO2 emissions follow a conservative path that leads to the stabilization of concentrations at 450 ppm. (2) North and South converge to a path...

Climate science indicates that climate stabilization requires low GHG emissions. Is this consistent with nondecreasing human welfare? Our welfare or utility index emphasizes education, knowledge, and the environment. We construct and calibrate a multigenerational model with intertemporal links provided by education, physical capital, knowledge and...

Mankind must cooperate to reduce greenhouse gas (GHG) emissions to prevent a catastrophic rise in global temperature, with its concomitant effects on sea level, rainfall, drought, storms, agricultural production, and human migration. What is the appropriate way of evaluating how the costs of reducing GHG emissions should be shared across the presen...

Let there be a positive (exogenous) probability that, at each date, the human species will disappear. We postulate an Ethical Observer (EO) who maximizes intertemporal welfare under this uncertainty, with expected-utility preferences. Various social welfare criteria entail alternative von Neumann Morgenstern utility functions for the EO: utilitaria...

This paper presents a model of electoral competition focusing on the formation of the public agenda. An incumbent government and a challenger party in opposition compete in elections by choosing the issues that will key out their campaigns. Giving salience to an issue implies proposing an innovative policy proposal, alternative to the status-quo. P...

This paper exploits the informational value of incumbency: incumbency confers voters information about governing politicians not available from challengers. We propose a measure of incumbency advantage that improves the use of pure reelection success. We also study the relationship between incumbency advantage, ideological bias, and terms in office...

This paper analyzes the political economy of immigration when the salient electoral issue is the level of immigrants and the relevant immigration policy is the expenditure in immigration control. We consider that immigration affects voters’ welfare through economic and non economic factors. We model political competition à la Wittman with the ideol...

Climate stabilization requires low GHG emissions. Is this consistent with nondecreasing human welfare? Our welfare index, called quality of life (QuoL), emphasizes education, knowledge, and the environment. We calibrate a multigenerational model with education, physical capital, knowledge and the environment. We reject discounted utilitarianism and...

Climate stabilization requires low GHG emissions. Is this consistent with nondecreasing human welfare? Our welfare index, called quality of life (QuoL), emphasizes education, knowledge, and the environment. We calibrate a multigenerational model with education, physical capital, knowledge and the environment. We reject discounted utilitarianism and...

This paper analyzes a two-alternative voting model with the distinctive feature that voters have preferences over margins of victory. We study voting contests with a finite as well as an infinite number of voters, and with and without mandatory voting. The main result of the paper is the existence and characterization of a unique equilibrium outcom...

This paper presents a model of electoral competition focusing on the formation of the public agenda. An incumbent government and a challenger party in opposition compete in elections by choosing the issues that will key out their campaigns. Giving salience to an issue implies proposing an innovative policy proposal, alternative to the status-quo. P...

This paper presents a model of electoral competition focusing on the formation of the public agenda. An incumbent government and a challenger party in opposition compete in elections by choosing the issues and their positions on those issues that will key out their campaigns. Giving salience to an issue implies proposing an innovative policy propos...

This paper proposes an argument that explains incumbency advantage without recurring to the collective irresponsibility of legislatures. For that purpose, we exploit the informational value of incumbency: incumbency confers voters information about governing politicians not available from challengers. Because there are many reasons for high reelect...

Recent studies of American politics evidence that political polarization of both the electorate and the political elite have moved "almost in tandem for the past half century" McCarty, Poole and Rosenthal, 2003:2), and that party polarization has steadily increased since the 1970s. On the other hand, the empirical literature on party platforms and...

We present an argument for changes in the franchise in which an elite split along economic interests uses the suffrage to influence implemented policies. Through the influence of these policies on the character of industrialization, we analyze the effects of franchise changes on economic growth. We identify in the social structure of society an exp...

It is frequently believed, and empirically observed, that the outcome of an election determines government action to at least some extent. However, the dominant two-party spatial model of political competition trivializes any post-electoral policy-making process by adopting a winner-takes-all assumption, that is, the party that obtains more than fi...

How should international aid be distributed? The most common view is according to some utilitarian formula: in order to maximize the average growth rate of aid recipients or the growth rate of income of the class of recipient countries.Recently, the The World Bank [The World Bank, 1998. Assessing aid, World bank policy research report] has publishe...

The classical literature on spatial majority voting postulates that all citizens vote. The Median Voter Theorem (MVT) then obtains when parties have perfect information on voter behavior and are either office-seekers ("Downsian") or ideological. This paper introduces abstention, a simple yet realistic modification. We show that the main features of...

Climate science indicates that climate stabilization requires low GHG emissions. Is this consistent with nondecreasing human welfare? Our welfare index, called quality of life (QuoL), emphasizes education, knowledge, and the environment. We construct and calibrate a multigenerational model with intertemporal links provided by education, physical c...