Thomas Piketty

The Evolution of Top Incomes: A Historical and International Perspective

This paper summarizes the main findings of the recent studies that have constructed top income and wealth shares series over the century for a number of countries using tax statistics. Most countries experience a dramatic drop in top income shares in the first part of the century due to a precipitous drop in large wealth holdings during the wars and depression shocks. Top income shares do not recover in the immediate post war decades. However, over the last 30 years, top income shares have increased substantially in English speaking countries but not at all in continental Europe countries or Japan. This increase is due to an unprecedented surge in top wage incomes starting in the 1970s and accelerating in the 1990s. As a result, top wage earners have replaced capital income earners at the top of the income distribution in English speaking countries. We discuss the proposed explanations and the main questions that remain open.

The Dynamics of the Wealth Distribution and the Interest Rate with Credit Rationing

With decreasing returns and first-best credit, the long-run interest rate and aggregate output are uniquely determined, and wealth dispersion among individuals or firms is irrelevant. Introducing credit rationing into the Solow model modifies these conclusions. Multiple stationary interest rates and wealth distributions can exist because higher initial rates can be self-reinforcing through higher credit rationing and lower capital accumulation. The wealth accumulation process is ergodic in every steady state, but wealth mobility is lower with higher steady-state interest rates. Aggregate output is higher in steady states with lower interest rates because credit is better allocated. Short-run interest rate or distribution shocks can be self-sustaining and can have long-run effects on output through the induced dynamics of the wealth distribution and credit rationing.

Income Inequality in France, 1901–1998

This paper uses data from income tax returns (1915–98), wage tax returns (1919–98), and inheritance tax returns (1902–94) in order to compute homogeneous, yearly estimates of income, wage, and wealth inequality for twentieth‐century France. The main conclusion is that the decline in income inequality that took place during the first half of the century was mostly accidental. In France, and possibly in a number of other countries as well, wage inequality has been extremely stable in the long run, and the secular decline in income inequality is for the most part a capital income phenomenon. Holders of large fortunes were badly hurt by major shocks during the 1914–45 period, and they were never able to fully recover from these shocks, probably because of the dynamic effects of progressive taxation on capital accumulation and pretax income inequality.

Dualism and Macroeconomic Volatility

This paper develops a simple macroeconomic model that shows that combining capital market imperfections together with unequal access to investment opportunities across individuals can generate endogenous and permanent fluctuations in aggregate GDP, investment, and interest rates. Reducing inequality of access may be a necessary condition for macroeconomic stabilization. Moreover, countercyclical fiscal policies have a role to play: in our model savings are underutilized in slumps because of the limited debt capacity of potential investors. Therefore, the government should issue public debt during recessions in order to absorb those idle savings and finance investment subsidies or tax cuts for investors.

Inequality in the long run

This Review presents basic facts regarding the long-run evolution of income and wealth inequality in Europe and the United States. Income and wealth inequality was very high a century ago, particularly in Europe, but dropped dramatically in the first half of the 20th century. Income inequality has surged back in the United States since the 1970s so that the United States is much more unequal than Europe today. We discuss possible interpretations and lessons for the future.

Theories of persistent inequality and intergenerational mobility

Publisher Summary This chapter reviews the existing theories of persistent inequality across generations. The chapter discusses total economic inequality both in wealth and in earnings and focuses on the intergenerational mobility dimension of total inequality. The chapter presents a nonexhaustive, nontechnical survey of existing empirical work about intergenerational mobility and persistent inequality among dynasties. The question of intergenerational mobility has always been one of the most controversial issues indeed, both in actual political conflicts and in academic writings by social scientists, and conflicting theories in this area have very often been motivated by conflicting qualitative perceptions of the extent of mobility (and conversely).

Wealth Concentration in a Developing Economy: Paris and France, 1807-1994

Using large samples of estate tax returns, we construct new series on wealth concentration in Paris and France from 1807 to 1994. Inequality increased until 1914 because industrial and financial estates grew dramatically. Then, adverse shocks, rather than a Kuznets-type process, led to a massive decline in inequality. The very high wealth concentration prior to 1914 benefited retired individuals living off capital income (rentiers) rather than entrepreneurs. The very rich were in their seventies and eighties, whereas they had been in their fifties a half century earlier and would be so again after World War II. Our results shed new light on ongoing debates about wealth inequality and growth.

A Theory of Optimal Inheritance Taxation

This paper derives optimal inheritance tax formulas that (a) capture the key equity-efficiency trade-off , (b) are expressed in terms of estimable sucient statistics, (c) are robust to the underlying structure of preferences. We consider dynamic stochastic models with general and heterogeneous bequest tastes and labor productivities. We limit ourselves to simple but realistic linear or two-bracket tax structures to obtain tractable formulas. We show that long-run optimal inheritance tax rates can always be expressed in terms of distributional parameters, aggregate behavioral elasticities and social preferences for redistribution. Importantly, those results carry over with tractable modi fications to (a)the case with social discounting (instead of steady-state welfare maximization), (b) the case with partly accidental bequests, (c) the standard Barro-Becker dynastic model. In all cases, the optimal inheritance tax rate increases with the concentration of bequest received and decreases with the elasticity of aggregate bequests to the net-of-tax rate. The optimal tax rate is positive and quantitatively large if concentration is high, the elasticity is low and society cares mostly about those receiving little inheritance. In contrast, the optimal tax rate is negative when society cares mostly about inheritors. We propose a calibration using micro-data for France and the United States. We find that for realistic parameters the optimal inheritance tax rate might be as large as 50%-60% - or even higher for top bequests, in line with historical experience.

Optimal Labor Income Taxation

This paper reviews recent developments in the theory of optimal labor income taxation. We emphasize connections between theory and empirical work that were initially lacking from optimal income tax theory. First, we provide historical and international background on labor income taxation and means-tested transfers. Second, we present the simple model of optimal linear taxation. Third, we consider optimal nonlinear income taxation with particular emphasis on the optimal top tax rate and the optimal profile of means-tested transfers. Fourth, we consider various extensions of the standard model including tax avoidance and income shifting, international migration, models with rent-seeking, relative income concerns, the treatment of couples and children, and non-cash transfers. Finally, we discuss limitations of the standard utilitarian approach and briefly review alternatives. In all cases, we use the simplest possible models and show how optimal tax formulas can be derived and expressed in terms of sufficient statistics that include social marginal welfare weights capturing societys value for redistribution, behavioral elasticities capturing the efficiency costs of taxation, as well as parameters of the earnings distribution. We also emphasize connections between actual practice and the predictions from theory, and in particular the limitations of both theory and empirical work in settling the political debate on optimal labor income taxation and transfers.

The information-aggregation approach to political institutions

This paper o⁄ers a short survey of recent contributions about the informationaggregation role of political institutions. We argue that these recent developments represent a promising come-back to the Condorcet’s original approach to political economy and allow to renew the eƒciency analysis of alternative political institutions. In the same way as in the economic literature on the price system and the informational rationale for non-market insitutions such as firms, this recent literature that the basic eƒciency of majority-rule voting and other electoral systems needs to be complemented by non-voting political institutions such as political parties, public debate and polls. ( 1999 Published by Elsevier Science B.V. All rights reserved.