Single-Crossing, Strategic Voting and the Median Choice Rule

Alejandro Saporiti and Fernando Tohmé

No 237, CEMA Working Papers: Serie Documentos de Trabajo. from Universidad del CEMA

Abstract: This paper studies the strategic foundations of the Representative Voter Theorem (Rothstein, 1991), also called the "second version" of the Median Voter Theorem. As a by-product, it also considers the existence of non-trivial strategy-proof social choice functions over the domain of single-crossing preference profiles. The main result presented here is that single-crossing preferences constitute a domain restriction on the real line that allows not only majority voting equilibria, but also non-manipulable choice rules. In particular, this is true for the median choice rule, which is found to be strategy-proof and group-strategic-proof not only over the full set of alternatives, but also over every possible policy agenda. The paper also shows the close relation between single-crossing and order-restriction. And it uses this relation together with the strategy-proofness of the median choice rule to prove that the collective outcome predicted by the Representative Voter Theorem can be implemented in dominant strategies through a simple mechanism in which, first, individuals select a representative among themselves, and then the representative voter chooses a policy to be implemented by the planner.

Keywords: Single-crossing; order-restriction; median voter; strategyproofness. (search for similar items in EconPapers)
JEL-codes: D70 D71 D78 (search for similar items in EconPapers)
Date: 2003-07
New Economics Papers: this item is included in nep-cdm, nep-pol and nep-ure
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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Related works:
Journal Article: Single-Crossing, Strategic Voting and the Median Choice Rule (2006)
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Persistent link: https://EconPapers.repec.org/RePEc:cem:doctra:237

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