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Voces populi and the art of listening

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Abstract

The strategy most damaging to many preferential election methods is to give insincerely low rank to the main opponent of one’s favourite candidate. Theorem 1 determines the 3-candidate Condorcet method that minimizes the number of noncyclic profiles allowing the strategic use of a given cyclic profile. Theorems 2, 3 and 4 establish conditions for an anonymous and neutral 3-candidate single-seat election to be monotonic and still avoid this strategy completely. Plurality elections combine these properties; among the others ‘conditional IRV’ gives the strongest challenge to the plurality winner. Conditional IRV is extended to any number of candidates. Theorem 5 is an impossibility of Gibbard–Satterthwaite type, describing three specific strategies that cannot all be avoided in meaningful anonymous and neutral election methods.

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Correspondence to Eivind Stensholt.

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Stensholt, E. Voces populi and the art of listening. Soc Choice Welf 35, 291–317 (2010). https://doi.org/10.1007/s00355-010-0442-0

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