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.
Keywords
Condorcet Winner Strategic Vote Approval Vote Election Method Borda CountPreview
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