The methodological strategy of using the concept of rationality as an 'intermediary' is particularly inappropriate in arriving at the proposition tha… - Amartya Sen

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The methodological strategy of using the concept of rationality as an 'intermediary' is particularly inappropriate in arriving at the proposition that actual behaviour must be self-interest maximizing. Indeed, it may not be quite as absurd to argue that people always actually do maximize their self-interest, as it is to argue that rationality must invariably demand maximization of self-interest. Universal selfishness as actuality may well be false, but universal selfishness as a requirement of rationality is patently absurd.