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Poverty Orderings with Asymmetric Attributes

  • Rocio Garcia-Diaz EMAIL logo
Published/Copyright: June 21, 2013

Abstract

We provide a theorem that lists the necessary and sufficient dominance conditions for the poverty comparisons of the bivariate distributions function when considering an asymmetric treatment of attributes. The normative justification for an asymmetric treatment is based on the compensation principle proposed by Muller and Trannoy (2012), under which it makes sense to use one attribute to compensate another. The formulation results in a generalization of the needs approach in poverty analysis proposed by Atkinson (1992). The dominance conditions we found lie between those obtained by Bourguignon and Chakravarty (2002) and Duclos, Sahn, and Younger (2006a) when attributes are symmetric and those obtained within the needs framework by Atkinson (1992) and Jenkins and Lambert (1993) when attributes are asymmetric, but one is of discrete nature.

Appendix

Derivation of formula [7]. To derive the conditions, this section is formulated in terms of a continuum of population, the suffix in the vector and is dropped. We start with the definition of the dominance condition

[9]
[9]

We integrate by parts eq. [9], and consider first the inner integral and integrate with respect to . This yields

[10]
[10]

After evaluating the first square bracketed term, we get

[11]
[11]

Then we substitute eq. [11] into eq. [9], we obtain

[12]
[12]

Integrating by parts, the first part of eq. [12] and evaluating the first term, we get

[13]
[13]

By using the definition of a conditional probability distribution, it reduces to

[14]
[14]

Integrating by parts, the second part of eq. [12] and evaluating the first term, we get

[15]
[15]

By using the definition of a conditional probability distribution (3), it reduces to

[16]
[16]

By substituting eqs. [14] and [16] into eq. [12], we obtain

[17]
[17]

The first term reduces to zero by the definition of a distribution function, and when we insert and , the whole expression reduces to

[18]
[18]

Let us now take into account the following properties implied by the focus definition:

These conditions are sufficient to replace the bounds and in eq. [18] by the poverty thresholds and . Therefore, we get

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  1. 1

    Gravel and Mukhopadhyay (2010) extended these dominance criteria for robust comparisons that involve more than two attributes. The approach is becoming increasingly acknowledged in the empirical applications (see among others, Sahn and Younger (2005); Duclos, Sahn, and Younger (2006b); Bibi and El Lahga (2008)).

Published Online: 2013-6-21
Published in Print: 2013-1-1

©2013 by Walter de Gruyter Berlin / Boston

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