Mutual majority criterion

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The mutual majority criterion is a criterion for evaluating electoral systems. It is also known as the majority criterion for solid coalitions and the generalized majority criterion. This criterion requires that whenever a majority of voters prefer a group of candidates above all others, then the winner must be a candidate from that group.^[1] The mutual majority criterion may also be thought of as the single-winner case of Droop-Proportionality for Solid Coalitions.