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Published in: Social Choice and Welfare 2/2019

20-03-2019 | Original Paper

A note on the decomposability of inequality measures

Authors: Frédéric Chantreuil, Sébastien Courtin, Kevin Fourrey, Isabelle Lebon

Published in: Social Choice and Welfare | Issue 2/2019

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Abstract

We propose a decomposition of inequality measures. By taking the example of the decomposition of income inequality by components, we show that this decomposition fits the definition of two elements: the sum of pure marginal contributions of income components and the sum of the pairwise interactions of all income components. This decomposition relies on the Shapley function and remains valid for a decomposition by subgroups and by components.

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Appendix
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Footnotes
1
See also Murofushi and Soneda (1993), Grabish (1996, 1997), Grabish et al. (2000), and Kojadinovic (2002, 2004, 2005).
 
2
For instance, if there are two components (\(m=2\)), the coalition considered to evaluate the interaction between i and j only includes these two components (\(t=0\)). Thus, in this particular case, the weight of this interaction is \(\frac{(2-0-2)!(0+1)!}{2!} = \frac{0!1!}{2!} = \frac{1}{2}\). Both components will have an importance equals to their PMC, plus half of value of their interaction.
 
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Metadata
Title
A note on the decomposability of inequality measures
Authors
Frédéric Chantreuil
Sébastien Courtin
Kevin Fourrey
Isabelle Lebon
Publication date
20-03-2019
Publisher
Springer Berlin Heidelberg
Published in
Social Choice and Welfare / Issue 2/2019
Print ISSN: 0176-1714
Electronic ISSN: 1432-217X
DOI
https://doi.org/10.1007/s00355-019-01183-9

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