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Poverty reduction: the paradox of the endogenous poverty line

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  • De MESNARD, Louis

    ()
    (LEG - CNRS UMR 5118 - Université de Bourgogne)

Abstract

When evaluating poverty, the relative poverty line may be considered as a percentage of the median income or it may be a percentage of the average income. It is proved that, with a poverty line relative to the median income, reducing poverty may become less costly in proportion to the total income as poverty increases (measured by the Sen, the Sen-Shorrocks- Thon or the Foster-Greer-Thorbecke poverty indexes) by passing from a Lorenz concentration curve to another curve associated with more poverty. This is obviously a paradox, although a largely overlooked one. However, it is shown that the paradox vanishes if the poverty line is relative to the average income. The demonstration is both experimental (algebraic or numeric where necessary) based on families of non-intersecting concentration curves produced by various algebraic functions (power function, exponential function or elliptic function but also produced by the Pareto distribution) and it is analytic. One concludes that the poverty line should be relative to the average income rather than to the median income.

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Bibliographic Info

Paper provided by LEG, Laboratoire d'Economie et de Gestion, CNRS, Université de Bourgogne in its series LEG - Document de travail - Economie with number 2007-05.

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Length: 30 pages
Date of creation: Nov 2007
Date of revision:
Handle: RePEc:lat:legeco:2007-05

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Keywords: Poverty; poverty line; poverty indexes; median;

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Cited by:
  1. Martin Ravallion & Shaohua Chen, 2011. "Weakly Relative Poverty," The Review of Economics and Statistics, MIT Press, vol. 93(4), pages 1251-1261, November.

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