scispace - formally typeset
Search or ask a question
Author

Wojciech Kopczuk

Bio: Wojciech Kopczuk is an academic researcher from Columbia University. The author has contributed to research in topics: Income tax & Indirect tax. The author has an hindex of 32, co-authored 89 publications receiving 3449 citations. Previous affiliations of Wojciech Kopczuk include University of British Columbia & University of Michigan.


Papers
More filters
Journal ArticleDOI
TL;DR: This article used Social Security Administration longitudinal earnings micro data since 1937 to analyze the evolution of inequality and mobility in the United States and found that long-term mobility among all workers has increased since the 1950s but has slightly declined among men.
Abstract: This paper uses Social Security Administration longitudinal earnings micro data since 1937 to analyze the evolution of inequality and mobility in the United States. Annual earnings inequality is U-shaped, decreasing sharply up to 1953 and increasing steadily afterward. Short-term earnings mobility measures are stable over the full period except for a temporary surge during World War II. Virtually all of the increase in the variance in annual (log) earnings since 1970 is due to increase in the variance of permanent earnings (as opposed to transitory earnings). Mobility at the top of the earnings distribution is stable and has not mitigated the dramatic increase in annual earnings concentration since the 1970s. Long-term mobility among all workers has increased since the 1950s but has slightly declined among men. The decrease in the gender earnings gap and the resulting substantial increase in upward mobility over a lifetime for women are the driving force behind the increase in long-term mobility among all workers.

546 citations

ReportDOI
TL;DR: This paper examined the effect of observed and unobserved heterogeneity in the desire to die with positive net worth and found that roughly three-fourths of the elderly single population has a bequest motive.
Abstract: We examine the effect of observed and unobserved heterogeneity in the desire to die with positive net worth. Using a structural life-cycle model nested in a switching regression with unknown sample separation, we find that roughly three-fourths of the elderly single population has a bequest motive. Both the presence and the magnitude of the bequest motive are statistically and economically significant. On average, households with a bequest motive spend about 25% less on consumption expenditures. We conclude that, among the elderly single households in our sample, about four-fifths of their net wealth will be bequeathed and approximately half of this is due to a bequest motive.

248 citations

Journal ArticleDOI
TL;DR: The authors used a panel of income tax returns spanning the two major U.S. tax reforms of the 1980s and a number of smaller tax law changes, and found that the elasticity of income reported on personal income tax return depends on the available deductions.

208 citations

Journal ArticleDOI
TL;DR: In this article, the authors derive a measure of the social benefit to affecting this elasticity and examine this effect in the solution to the optimal income taxation problem when such an instrument is available, first in a general model and then in an example when the government chooses the income tax base.

189 citations

ReportDOI
TL;DR: In this article, a homogeneous series on top wealth shares from 1916 to 2000 in the United States using estate tax return data was presented, showing that the top wealth share was very high at the beginning of the period.
Abstract: This paper presents new homogeneous series on top wealth shares from 1916 to 2000 in the United States using estate tax return data. Top wealth shares were very high at the beginning of the period ...

185 citations


Cited by
More filters
Posted Content
TL;DR: In this article, the authors present three key facts about income and wealth inequality in the long run emerging from my book, Capital in the Twenty-First Century, and seek to sharpen and refocus the discussion about those trends.
Abstract: In this article, I present three key facts about income and wealth inequality in the long run emerging from my book, Capital in the Twenty-First Century, and seek to sharpen and refocus the discussion about those trends. In particular, I clarify the role played by r > g in my analysis of wealth inequality. I also discuss some of the implications for optimal taxation, and the relation between capital-income ratios and capital shares.

7,011 citations

Posted Content
TL;DR: A theme of the text is the use of artificial regressions for estimation, reference, and specification testing of nonlinear models, including diagnostic tests for parameter constancy, serial correlation, heteroscedasticity, and other types of mis-specification.
Abstract: Offering a unifying theoretical perspective not readily available in any other text, this innovative guide to econometrics uses simple geometrical arguments to develop students' intuitive understanding of basic and advanced topics, emphasizing throughout the practical applications of modern theory and nonlinear techniques of estimation. One theme of the text is the use of artificial regressions for estimation, reference, and specification testing of nonlinear models, including diagnostic tests for parameter constancy, serial correlation, heteroscedasticity, and other types of mis-specification. Explaining how estimates can be obtained and tests can be carried out, the authors go beyond a mere algebraic description to one that can be easily translated into the commands of a standard econometric software package. Covering an unprecedented range of problems with a consistent emphasis on those that arise in applied work, this accessible and coherent guide to the most vital topics in econometrics today is indispensable for advanced students of econometrics and students of statistics interested in regression and related topics. It will also suit practising econometricians who want to update their skills. Flexibly designed to accommodate a variety of course levels, it offers both complete coverage of the basic material and separate chapters on areas of specialized interest.

4,284 citations

Journal ArticleDOI
TL;DR: The authors showed that the large shocks that capital owners experienced during the Great Depression and World War II have had a permanent effect on top capital incomes and argued that steep progressive income and estate taxation may have prevented large fortunes from fully recovering from these shocks.
Abstract: This paper presents new homogeneous series on top shares of income and wages from 1913 to 1998 in the United States using individual tax returns data. Top income and wages shares display a U-shaped pattern over the century. Our series suggest that the large shocks that capital owners experienced during the Great Depression and World War II have had a permanent effect on top capital incomes. We argue that steep progressive income and estate taxation may have prevented large fortunes from fully recovering from these shocks. Top wage shares were flat before World War II, dropped precipitously during the war, and did not start to recover before the late 1960s but are now higher than before World War II. As a result, the working rich have replaced the rentiers at the top of the income distribution.

3,263 citations

Posted Content
TL;DR: A recent literature has constructed top income shares time series over the long run for more than twenty countries using income tax statistics as discussed by the authors, and the estimation methods and issues that arise when constructing top income share series, including income definition and comparability over time and across countries, tax avoidance and tax evasion.
Abstract: A recent literature has constructed top income shares time series over the long run for more than twenty countries using income tax statistics. Top incomes represent a small share of the population but a very significant share of total income and total taxes paid. Hence, aggregate economic growth per capita and Gini inequality indexes are sensitive to excluding or including top incomes. We discuss the estimation methods and issues that arise when constructing top income share series, including income definition and comparability over time and across countries, tax avoidance, and tax evasion. We provide a summary of the key empirical findings. Most countries experience a dramatic drop in top income shares in the first part of the twentieth century in general due to shocks to top capital incomes during the wars and depression shocks. Top income shares do not recover in the immediate postwar decades. However, over the last thirty years, top income shares have increased substantially in English speaking countries and in India and China but not in continental European countries or Japan. This increase is due in part to an unprecedented surge in top wage incomes. As a result, wage income comprises a larger fraction of top incomes than in the past. Finally, we discuss the theoretical and empirical models that have been proposed to account for the facts and the main questions that remain open.

1,647 citations

Journal ArticleDOI
TL;DR: A recent literature has constructed top income shares time series over the long run for more than twenty countries using income tax statistics as discussed by the authors, and the estimation methods and issues that arise when constructing top income share series, including income definition and comparability over time and across countries, tax avoidance and tax evasion.
Abstract: A recent literature has constructed top income shares time series over the long run for more than twenty countries using income tax statistics. Top incomes represent a small share of the population but a very significant share of total income and total taxes paid. Hence, aggregate economic growth per capita and Gini inequality indexes are sensitive to excluding or including top incomes. We discuss the estimation methods and issues that arise when constructing top income share series, including income definition and comparability over time and across countries, tax avoidance, and tax evasion. We provide a summary of the key empirical findings. Most countries experience a dramatic drop in top income shares in the first part of the twentieth century in general due to shocks to top capital incomes during the wars and depression shocks. Top income shares do not recover in the immediate postwar decades. However, over the last thirty years, top income shares have increased substantially in English speaking countries and in India and China but not in continental European countries or Japan. This increase is due in part to an unprecedented surge in top wage incomes. As a result, wage income comprises a larger fraction of top incomes than in the past. Finally, we discuss the theoretical and empirical models that have been proposed to account for the facts and the main questions that remain open.

1,511 citations