A note on the relationship between top income shares and the Gini coefficient
When a very top group of the income distribution, infinitesimal in numbers, owns a finite share S of total income, the Gini coefficient G can be approximated by G*(1 - S)Â +Â S, where G* is the Gini coefficient for the rest of the population. We provide a simple formal proof for this expression, give a general formula of the relationship when the top group is not infinitesimal, and offer two applications as illustrations.
References listed on IDEAS
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- Dagum, Camilo, 1997. "A New Approach to the Decomposition of the Gini Income Inequality Ratio," Empirical Economics, Springer, vol. 22(4), pages 515-531.
- Andrew Leigh, 2007.
"How Closely Do Top Income Shares Track Other Measures of Inequality?,"
Royal Economic Society, vol. 117(524), pages 619-633, November.
- Andrew Leigh, 2007. "How Closely Do Top Income Shares Track Other Measures of Inequality?," CEPR Discussion Papers 562, Centre for Economic Policy Research, Research School of Economics, Australian National University.
- Dagum, Camilo, 1987. "Measuring the Economic Affluence between Populations of Income Receivers," Journal of Business & Economic Statistics, American Statistical Association, vol. 5(1), pages 5-12, January.
- Atkinson, A. B. & Piketty, Thomas (ed.), 2007. "Top Incomes Over the Twentieth Century: A Contrast Between Continental European and English-Speaking Countries," OUP Catalogue, Oxford University Press, number 9780199286881. Full references (including those not matched with items on IDEAS)
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