Gibbard-Satterthwaite theorem: Difference between revisions

The '''Gibbard-Satterthwaite theorem''' states that every unimposing [[voting system]] (one in which every preference order is achievable) which chooses between three or more candidates, must be either dictatorial or manipulable (i.e. susceptible to [[tactical voting]]). It follows from [[Arrow's impossibility theorem]].

 

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