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Decomposing poverty changes into vertical and horizontal components

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  • Sami Bibi
  • Jean-Yves Duclos

Abstract

Variations in aggregate poverty indices can be due to differences in average poverty intensity, to changes in the welfare distances between those poor of initially unequal welfare status and/or to emerging disparities in welfare among those poor of initially similar welfare status. This note uses a general cost-of-inequality approach that decomposes the total change in poverty into a sum of indices of each of these three components. This decomposition can serve inter alia to integrate horizontal and vertical equity criteria in the poverty alleviation assessment of social and economic programmes. The use of these measures is briefly illustrated using Tunisian data. Copyright Blackwell Publishers Ltd and the Board of Trustees of the Bulletin of Economic Research, 2005.

Suggested Citation

  • Sami Bibi & Jean-Yves Duclos, 2005. "Decomposing poverty changes into vertical and horizontal components," Bulletin of Economic Research, Wiley Blackwell, vol. 57(2), pages 205-215, April.
  • Handle: RePEc:bla:buecrs:v:57:y:2005:i:2:p:205-215
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    References listed on IDEAS

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    1. Foster, James & Greer, Joel & Thorbecke, Erik, 1984. "A Class of Decomposable Poverty Measures," Econometrica, Econometric Society, vol. 52(3), pages 761-766, May.
    2. Tuck, L. & Lindert, K., 1996. "From Universal Food Subsidies to a Self-Targeted Program: A Case Study in Tunisian Reform," World Bank - Discussion Papers 351, World Bank.
    3. Peter Lambert & Xavier Ramos, 1997. "Horizontal Inequity and Vertical Redistribution," International Tax and Public Finance, Springer;International Institute of Public Finance, vol. 4(1), pages 25-37, January.
    4. Jean-Yves Duclos & Peter Lambert, "undated". "A Normative Approach to Measuring Classical Horizontal Inequity," Discussion Papers 97/3, Department of Economics, University of York.
    5. Charles Blackorby & David Donaldson, 1984. "Ethical Social Index Numbers and the Measurement of Effective Tax-Benefit Progressivity," Canadian Journal of Economics, Canadian Economics Association, vol. 17(4), pages 683-694, November.
    6. Atkinson, Anthony B., 1970. "On the measurement of inequality," Journal of Economic Theory, Elsevier, vol. 2(3), pages 244-263, September.
    7. Jenkins, Stephen P & Lambert, Peter J, 1997. "Three 'I's of Poverty Curves, with an Analysis of UK Poverty Trends," Oxford Economic Papers, Oxford University Press, vol. 49(3), pages 317-327, July.
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    Cited by:

    1. Sami Bibi, 2006. "Growth with Equity is Better for the Poor," Cahiers de recherche 0640, CIRPEE.
    2. Sami Bibi, 2005. "When is Economic Growth Pro-Poor? Evidence from Tunisia," Cahiers de recherche 0522, CIRPEE.
    3. Hatem Jemmali, 2016. "Inequality of Opportunities among Tunisian Children over Time and Space," Working Papers 1048, Economic Research Forum, revised 09 Jan 2016.

    More about this item

    JEL classification:

    • D12 - Microeconomics - - Household Behavior - - - Consumer Economics: Empirical Analysis
    • D63 - Microeconomics - - Welfare Economics - - - Equity, Justice, Inequality, and Other Normative Criteria and Measurement
    • H53 - Public Economics - - National Government Expenditures and Related Policies - - - Government Expenditures and Welfare Programs
    • I32 - Health, Education, and Welfare - - Welfare, Well-Being, and Poverty - - - Measurement and Analysis of Poverty
    • I38 - Health, Education, and Welfare - - Welfare, Well-Being, and Poverty - - - Government Programs; Provision and Effects of Welfare Programs

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