An Index of Inequality: With Applications to Horizontal Equity and Social Mobility
An index of Inequality is constructed which decomposes into two components, corresponding to vertical and "horizontal" equity respectively. Horizontal equity Is defined in terms of changes in the ordering of a distribution. The proposed index is a function to two inequality aversion parameters. One empirical application is for comparison of a pre-tax distribution with a post-tax distribution, and an example of this is given for the distribution of incomes in the UK in 1977. There is a trade-off between "horizontal"and vertical equity, and for particular combinations of the inequality aversion parameters the original distribution will be preferred to the final distribution. The paper concludes with an application of the proposed index to a model of optimal taxation.
|Date of creation:||Apr 1980|
|Date of revision:|
|Publication status:||published as King, Mervyn A. "An Index of Inequality: With Application Horizontal Equityand Social Mobility." Econometrica, Vo. 51, No. 1, (1982), pp. 99-115.|
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- Rosen, Harvey S, 1978. "An Approach to the Study of Income, Utility, and Horizontal Equity," The Quarterly Journal of Economics, MIT Press, vol. 92(2), pages 307-22, May.
- Rosen, Harvey S., 1976. "A methodology for evaluating tax reform proposals," Journal of Public Economics, Elsevier, vol. 6(1-2), pages 105-121.
- Cowell, Frank A, 1980. "On the Structure of Additive Inequality Measures," Review of Economic Studies, Wiley Blackwell, vol. 47(3), pages 521-31, April.
- Allingham, M. G., 1975. "Towards an ability tax," Journal of Public Economics, Elsevier, vol. 4(4), pages 361-376, November.
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