Pareto efficiency: Difference between revisions
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The '''Pareto criterion''' or unanimity criterion is a basic criterion for evaluating [[voting system|voting systems]]. It can be defined in this way:
{{definition|If every voter prefers alternative X over alternative Y, then the system prefers X over Y}}
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'''Independence of Pareto-dominated alternatives (IPDA)''' says that if one option (X) wins an election, and a new alternative (Y) is added, X will win the election if Y is Pareto-dominated (using the second version of the criterion).
The Pareto criterion is Hare-[[PSC]] in the single-winner case.
[[Category:Voting system criteria]]
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