Plurality rule and unanimity of revealed preference

Behavioral models can accommodate some anomalous social choices that result from aggregation of individual preferences. However, the use of behavioral methods of revealed preference in social choice may produce new conceptual difficulties that do not exist under standard economic models. One such difficulty is the problem of unanimity in revealed preference: individual choices may reveal that every individual strictly prefers x to y and yet y is revealed to be strictly socially preferred to x . Under plurality rule, the problem of unanimity in revealed preference holds for some behavioral methods of revealed preference, but not for others.