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Permalink: http://hdl.handle.net/1866/19938

Positively responsive collection choice rules and majority rule: a generalization of May's theorem to many alternatives

Article [Version of Record]
Thumbnail
Cahier_2018-1.pdf (125.4Kb)
Publisher(s)
Université de Montréal. Département de sciences économiques.
2018-04
Author(s)
Horan, Sean
Osborne, Martin J.
Sanver, M. Remzi
Abstract(s)
A collective choice rule selects a set of alternatives for each collective choice problem. Suppose that the alternative ’x’, is in the set selected by a collective choice rule for some collective choice problem. Now suppose that ‘x’ rises above another selected alternative ‘y’ in some individual’s preferences. If the collective choice rule is “positively responsive”, ‘x’ remains selected but ‘y’ is no longer selected. If the set of alternatives contains two members, an anonymous and neutral collective choice rule is positively responsive if and only if it is majority rule (May 1952). If the set of alternatives contains three or more members, a large set of collective choice rules satisfy these three conditions. We show, however, that in this case only the rule that assigns to every problem its strict Condorcet winner satisfies the three conditions plus Nash’s version of “independence of irrelevant alternatives” for the domain of problems that have strict Condorcet winners. Further, no rule satisfies the four conditions for the domain of all preference relations.
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  • FAS - Département de sciences économiques - Cahiers de recherche [539]

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