May's theorem

Social choice theorem on superiority of majority voting

In social choice theory, May's theorem, also called the general possibility theorem, says that majority vote is the unique ranked social choice function between two candidates that satisfies the following criteria:Anonymity – each voter is treated identically, Neutrality – each candidate is treated identically, Positive responsiveness – a voter changing their mind to support a candidate cannot cause that candidate to lose, had the candidate not also lost without that voters' support.

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