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 followsis fromrelated to [[Arrow's impossibility theorem]] and the [[Balinski–Young theorem]].