"Arrow’s Impossibility Theorem is quite surprising. It shows that three very plausible and desirable features of a social decision mechanism are inconsistent with democracy: there is no “perfect” way to make social decisions. There is no perfect way to “aggregate” individual preferences to make one social preference. If we want to find a way to aggregate individual preferences to form social preferences, we will have to give up one of the properties of a social decision mechanism described in Arrow’s theorem."
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Hal Varian, Microeconomics: A Modern Approach, Chapter 33. Welfare
https://en.wikiquote.org/wiki/Arrow's_impossibility_theorem
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Arrow's impossibility theorem
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