Strategic Abstention Based on Preference Extensions: Positive Results and Computer-Generated Impossibilities
نویسندگان
چکیده
Preliminaries • A social choice function (SCF) maps every preference profile to a subset of the alternatives. • An SCF is majoritarian if it only depends on the (unweighted) majority comparisons between alternatives. • An SCF satisfies independence of indifference voters (IIV) if an agent who is indifferent among all alternatives does not change the outcome. • A preference profile R’ is an f-improvement over R if alternatives in f(R) are not weakened from R to R’. An SCF f satisfies set monotonicity if f(R) = f(R’) whenever R’ is an f-improvement over R. • An SCF is Pareto-optimal if it never selects a Pareto-dominated alternative.
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