A fundamental structure of strategy-proof social choice correspondences with restricted preferences over alternatives

Shin Sato ()

Social Choice and Welfare, 2014, vol. 42, issue 4, 851 pages

Abstract: I prove that under each strategy-proof and unanimous social choice correspondence, there is at least one agent who is decisive. Because the result is established on a weak requirement on preferences over sets, the existence of a decisive agent is an underlying feature of most strategy-proof and unanimous social choice correspondences. Moreover, I consider a restriction on the space of preferences over alternatives. I prove that circular sets of preferences over alternatives are sufficient for the existence of a decisive agent. Copyright Springer-Verlag Berlin Heidelberg 2014

Date: 2014
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DOI: 10.1007/s00355-013-0755-x

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