Topological aggregation, the case of an infinite population

Luc Lauwers

Social Choice and Welfare, 1997, vol. 14, issue 2, 319-332

Abstract: The literature on infinite Chichilnisky rules considers two forms of anonymity: a weak and a strong. This note introduces a third form: bounded anonymity. It allows us to prove an infinite analogue of the "Chichilnisky- Heal-resolution" close to the original theorem: a compact parafinite CW-complex X admits a bounded anonymous infinite rule if and only if X is contractible. Furthermore, bounded anonymity is shown to be compatible with the finite and the [0, 1]-continuum version of anonymity and allows the construction of convex means in infinite populations. With X=[0, 1], the set of linear bounded anonymous rules coincides with the set of medial limits.

Date: 1997
Note: Received: 30 October 1993/Accepted: 22 April 1996
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