Expected comparative utility theory: A new theory of instrumental rationality


Starting from the premise that expected utility (EU) is the correct criterion of rational preference both in decision cases under certainty and decision cases under risk, I argue that EU theory is a false theory of instrumental rationality. In its place, I argue for a new theory of instrumental rationality, namely expected comparative utility (ECU) theory. I show that in some commonplace decisions under risk, ECU theory delivers different verdicts from those of EU theory.

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