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Result that no ranked-choice system is spoilerproof
Arrow's impossibility theorem is a key result in social choice showing that no rank-order method for collective decision-making can behave rationally or coherently. Specifically, any such rule violates independence of irrelevant alternatives, the principle that a choice between A {\displaystyle A} and B {\displaystyle B} should not depend on the quality of a third, unrelated option C {\displaystyl... Wikipedia