Gibbard-Satterthwaite theorem (English, name)
expansion: the Gibbard-Satterthwaite theorem
Senses:
glosses: A theorem dealing with deterministic ordinal electoral systems that choose a single winner, stating that for every voting rule, one of the following three things must hold: (i) the rule is dictatorial, i.e. there exists a distinguished voter who can choose the winner; or (ii) the rule limits the possible outcomes to two alternatives only; or (iii) the rule is susceptible to tactical voting: in certain conditions some voter's sincere ballot may not defend their opinion best.
Forms:
form: the Gibbard-Satterthwaite theorem
tags: canonical