Gibbard-Satterthwaite theorem: Difference between revisions

In [[voting system]]s, theThe '''Gibbard-Satterthwaite theorem''' states that every unimposing [[voting methodsystem]] (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]].