What is ARROW'S IMPOSSIBILITY THEOREM? What does ARROW'S IMPOSSIBILITY THEOREM mean?
The paradox of democracy: Arrow impossibility explained
What is TACTICAL VOTING? What does TACTICAL VOTING mean? TACTICAL VOTING meaning & explanation
What is CARDINAL VOTING? What does CARDINAL VOTING mean? CARDINAL VOTING meaning & explanation
What is MEDIAN VOTER THEOREM? What does MEDIAN VOTER THEOREM mean? MEDIAN VOTER THEOREM meaning
In social choice theory, the Gibbard–Satterthwaite theorem is a result published independently by philosopher Allan Gibbard in 1973 and economist Mark Satterthwaite in 1975. It deals with deterministic ordinal electoral systems that choose a single winner. It states that for every voting rule, one of the following three things must hold:The rule is dictatorial, i.e. there exists a distinguished voter who can choose the winner; or
The rule limits the possible outcomes to two alternatives only; or
The rule is susceptible to tactical voting: in certain conditions some voter's sincere ballot may not defend their opinion best.