Tom Krebs

Department of Economics
University of Mannheim
68131 Mannheim

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NBER Working Papers and Publications

July 2017Income Mobility, Income Risk and Welfare
with Pravin Krishna, William F. Maloney: w23578
This paper presents a framework for the quantitative analysis of individual income dynamics, mobility and welfare, with ex-ante identical individuals facing a stochastic income process and market incompleteness implying that they are unable to insure against persistent shocks to income. We show how the parameters of the income process can be estimated using repeated cross-sectional data with a short panel dimension, and use a simple consumption-saving model for quantitative analysis of mobility and welfare. Our empirical application, using data on individual incomes from Mexico, provides striking results. Most of measured income mobility is driven by measurement error or transitory income shocks and therefore (almost) welfare-neutral. Only a small part of measured income mobility is due to...
December 2011Human Capital Risk, Contract Enforcement, and the Macroeconomy
with Moritz Kuhn, Mark L. J. Wright: w17714
We develop a macroeconomic model with physical and human capital, human capital risk, and limited contract enforcement. We show analytically that young (high-return) households are the most exposed to human capital risk and are also the least insured. We document this risk-insurance pattern in data on life-insurance drawn from the Survey of Consumer Finance. A calibrated version of the model can quantitatively account for the life-cycle variation of insurance observed in the US data and implies welfare costs of under-insurance for young households that are equivalent to a 4 percent reduction in lifetime consumption. A policy reform that makes consumer bankruptcy more costly leads to a substantial increase in the volume of credit and insurance.

Published: Tom Krebs & Moritz Kuhn & Mark L. J. Wright, 2015. "Human Capital Risk, Contract Enforcement, and the Macroeconomy," American Economic Review, American Economic Association, vol. 105(11), pages 3223-72, November. citation courtesy of

April 2005Trade Policy, Income Risk, and Welfare
with Pravin Krishna, William Maloney: w11255
This paper studies empirically the relationship between trade policy and individual income risk faced by workers, and uses the estimates of this empirical analysis to evaluate the welfare effect of trade reform. The analysis proceeds in three steps. First, longitudinal data on workers are used to estimate time-varying individual income risk parameters in various manufacturing sectors. Second, the estimated income risk parameters and data on trade barriers are used to analyze the relationship between trade policy and income risk. Finally, a simple dynamic incomplete-market model is used to assess the corresponding welfare costs. In the implementation of this methodology using Mexican data, we find that trade policy changes have a significant short run effect on income risk. Further, while t...

Published: Tom Krebs & Pravin Krishna & William Maloney, 2010. "Trade Policy, Income Risk, and Welfare," The Review of Economics and Statistics, MIT Press, vol. 92(3), pages 467-481, October. citation courtesy of

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