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International Income Inequality: Measuring PPP Bias by Estimating Engel Curves for Food

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  • Ingvild Alm s

Abstract

Purchasing power adjusted incomes applied in cross-country comparisons are measured with bias. In this paper, we estimate the purchasing power parity (PPP) bias in Penn World Table incomes and provide corrected real incomes. The bias is substantial and systematic: the poorer is a country, the more its income tends to be overestimated. Consequently, international income inequality is substantially underestimated. Our methodological contribution is to exploit the analogies between PPP bias and the bias in consumer price index (CPI) numbers. The PPP bias, and consequently real incomes, is measured by estimating Engel curves for food, which is an established method of measuring CPI bias.

Suggested Citation

  • Ingvild Alm s, 2008. "International Income Inequality: Measuring PPP Bias by Estimating Engel Curves for Food," LIS Working papers 473, LIS Cross-National Data Center in Luxembourg.
    • Handle: RePEc:lis:liswps:473
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    1. Branko Milanovic, 2002. "True World Income Distribution, 1988 and 1993: First Calculation Based on Household Surveys Alone," Economic Journal, Royal Economic Society, vol. 112(476), pages 51-92, January.
    2. Timothy K.M. Beatty & Erling Røed Larsen, 2005. "Using Engel curves to estimate bias in the Canadian CPI as a cost of living index," Canadian Journal of Economics/Revue canadienne d'économique, John Wiley & Sons, vol. 38(2), pages 482-499, May.
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    10. Steve Dowrick & Muhammad Akmal, 2005. "Contradictory Trends In Global Income Inequality: A Tale Of Two Biases," Review of Income and Wealth, International Association for Research in Income and Wealth, vol. 51(2), pages 201-229, June.
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    Cited by:

    1. Filho, Irineu de Carvalho & Chamon, Marcos, 2012. "The myth of post-reform income stagnation: Evidence from Brazil and Mexico," Journal of Development Economics, Elsevier, vol. 97(2), pages 368-386.

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    More about this item

    JEL classification:

    • D1 - Microeconomics - - Household Behavior
    • E31 - Macroeconomics and Monetary Economics - - Prices, Business Fluctuations, and Cycles - - - Price Level; Inflation; Deflation
    • F01 - International Economics - - General - - - Global Outlook

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