Fairness under Uncertainty
Ever since its introduction by Foley  and Varian , the notion of fairness has been one of the most extensively used notion to evaluate allocations on an ethical basis. Whereas there is an extensive literature on the efficiency properties of allocations in economies with uncertainty the concept of an envy-free allocation has not been widely studied in economies with uncertainty. We introduce two very natural notions of equity in an economy under uncertainty, namely ex ante and ex post equity, show they can contradict efficiency requirements. In particular, the set of ex ante efficient and ex post envy-free allocations may be empty. We nevertheless show that, under special circumstances, one may prove the existence of allocations that are both ex ante efficient and ex post envy-free. Such is the case, in particular, in an economy with individual risk and no aggregate risk.
|Date of creation:||2002|
|Date of revision:|
|Publication status:||Published in Economics Bulletin, Economics Bulletin, 2002, 4 (18), pp.1-7|
|Note:||View the original document on HAL open archive server: https://halshs.archives-ouvertes.fr/halshs-00086032|
|Contact details of provider:|| Web page: https://hal.archives-ouvertes.fr/|
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- Cass, David & Chichilnisky, Graciela & Wu, Ho-Mou, 1996. "Individual Risk and Mutual Insurance," Econometrica, Econometric Society, vol. 64(2), pages 333-41, March.
- Varian, Hal R., 1974.
"Equity, envy, and efficiency,"
Journal of Economic Theory,
Elsevier, vol. 9(1), pages 63-91, September.
- Malinvaud, E, 1973. "Markets for an Exchange Economy with Individual Risks," Econometrica, Econometric Society, vol. 41(3), pages 383-410, May.
- Peter A. Diamond, 1967. "Cardinal Welfare, Individualistic Ethics, and Interpersonal Comparison of Utility: Comment," Journal of Political Economy, University of Chicago Press, vol. 75, pages 765.
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