Equally-distributed equivalent utility, ex post egalitarianism and utilitarianism

Simon Grant*, Atsushi Kajii, Ben Polak, Zvi Safra

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


We provide an axiomatization of expected equally-distributed equivalent-utility social welfare functions in the context of Harsanyi's impartial observer theorem. For this family of social welfare functions, we show what additional axiom is necessary and sufficient for the observer to exhibit aversion to ex post inequality. We also relate this axiomatization to our axiomatization in a companion paper of generalized utilitarian social welfare functions. Given certain richness assumptions, the only social welfare functions that belong to both families are the utilitarian.

Original languageEnglish
Pages (from-to)1545-1571
Number of pages27
JournalJournal of Economic Theory
Issue number4
StatePublished - Jul 2012


FundersFunder number
Henry Crown Institute of Business Research
Inamori Foundation
Israel Science Foundation1299/05


    • Ex post egalitarianism
    • Harsanyi's (impartial) observer
    • Social welfare function
    • Utilitarianism


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