Theory and Decision 74 (3):335-355 (2013)

Ulle Endriss
University of Amsterdam
Under approval voting, each voter can nominate as many candidates as she wishes and the election winners are those candidates that are nominated most often. A voter is said to have voted sincerely if she prefers all those candidates she nominated to all other candidates. As there can be a set of winning candidates rather than just a single winner, a voter’s incentives to vote sincerely will depend on what assumptions we are willing to make regarding the principles by which voters extend their preferences over individual candidates to preferences over sets of candidates. We formulate two such principles, replacement and deletion, and we show that, under approval voting, a voter who accepts those two principles and who knows how the other voters will vote will never have an incentive to vote insincerely. We then discuss the consequences of this result for a number of standard principles of preference extension in view of sincere voting under approval voting.
Keywords Approval voting  Manipulation  Ranking sets of objects
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DOI 10.1007/s11238-012-9301-z
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Measurement Theory.Fred S. Roberts (ed.) - 1985 - Cambridge University Press.
Even-Chance Lotteries in Social Choice Theory.Peter C. Fishburn - 1972 - Theory and Decision 3 (1):18-40.
Choosers as Extension Axioms.Bora Erdamar & M. Remzi Sanver - 2009 - Theory and Decision 67 (4):375-384.

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