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universal domain


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In social choice, the requirement that a procedure should be able to produce a definite outcome for every logically possible input of individual preference orderings. The rule ‘Choose x over y if a majority of voters vote for x, and y if a majority of voters vote for y’ fails to satisfy universal domain because it fails to cover the case where neither happens. The rule ‘Choose x over y if a majority of voters vote for x, otherwise choose y’ does satisfy universal domain, at the expense of giving y an edge over x.

Subjects: Politics.


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