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Estimating Income Mobility When Income is Measured with Error: The Case of South Africa
June 29, 2016Poverty and Applied Microeconomics Seminar Series

Speaker: Rulof Burger is an Associate Professor of Economics at Stellenbosch University. More »

Abstract: There are long-standing concerns that household income mobility is over-estimated due to measurement errors in reported incomes, especially in developing countries where collecting reliable survey data is often difficult. We propose a new approach that exploits the existence of three waves of panel data to simultaneously estimate the extent of income mobility and the reliability of the income measure. This estimator is more efficient than 2SLS estimators used in other studies and produces over-identifying restrictions that can be used to test the validity of our identifying assumptions. We also introduce a nonparametric generalisation in which both the speed of income convergence and the reliability of the income measure varies with the initial income level. This approach is applied to a three-wave South African panel dataset. The results suggest that the conventional method over-estimates the extent of income mobility by a factor of more than 4 and that about 20% of variation in reported household income is due to measurement error. This result is robust to the choice of income mobility measure. Nonparametric estimates show that there is relatively high (upward) income mobility for poor households, but very little (downward) income mobility for rich households, and that income is more reliably captured for rich than for poor households.


Last Updated: Jun 24, 2016

The Poverty and Applied Micro Seminar Series is a weekly series hosted by the World Bank's research department. The series invites leading researchers in applied microeconomics from the fields of poverty, human development and public service delivery, agriculture and rural development, political economy, behavioral economics, private sector development, and a range of other fields to present the results of their most recent research in a seminar format. The full list of seminars can be viewed here.

Event Details
  • Date: June 29, 2016
  • Location: MC 3-570
  • Time: 12:30 - 2:00 pm
  • CONTACT: Shweta Mesipam
  • smesipam@worldbank.org

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