Weak independent decisiveness and the existence of a unique vetoer

Economics Letters 131:59–61 (2015)
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Abstract

This paper is concerned with an aggregation of individual preferences. We introduce the concept of weak independent decisiveness, which is a weakening of Sen’s independent decisiveness. We show that a Paretian social welfare function satisfies weak independent decisiveness if and only if the family of weakly decisive sets forms an ultrafilter.

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