Two-stage majoritarian choice

Sean Horan and Yves Sprumont ()

No 2020-05, Cahiers de recherche from Universite de Montreal, Departement de sciences economiques

Abstract: We propose a class of decisive collective choice rules that rely on an exogenous linear ordering to partition the majority relation into two acyclic relations. The first relation is used to obtain a shortlist of the feasible alternatives while the second is used to make a final choice. In combination with faithfulness to the underlying majority relation, rules in this class are characterized by two desirable rationality properties: Sen’s expansion consistency and a version of Manzini and Mariotti’s weak WARP. The rules also satisfy natural adaptations of Arrow’s independence of irrelevant alternatives and May’s positive responsiveness.

Keywords: Majority rule; Decisiveness; IIA; Monotonicity; Rational shortlist methods (search for similar items in EconPapers)
JEL-codes: D71 D72 (search for similar items in EconPapers)
Date: 2020-05
New Economics Papers: this item is included in nep-des and nep-mic
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http://hdl.handle.net/1866/23365 (application/pdf)

Related works:
Journal Article: Two-stage majoritarian choice (2022)
Working Paper: Two-Stage Majoritarian Choice (2020)
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Persistent link: https://EconPapers.repec.org/RePEc:mtl:montde:2020-05

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