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Gibbard–Satterthwaite theorem


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All ‘reasonable’ methods of preference aggregation can be manipulated by the misrepresentation of preferences. This was proved independently by both Gibbard (Econometrica, 1973) and Satterthwaite (Journal of Economic Theory, 1975). The theorem implies that under any determinate electoral system there may be incentives for voters to misrepresent their preferences and so engage in tactical voting.

Stephen Fisher

SF

Subjects: Politics.


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