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Is the Theory of Rationality a Good Idea?
Theories are useful because they can tell us things in broad brush. So even if we think expected utility maximization is the right theory of rationality, it might be the case that you nonetheless shouldn't use it in a lot of decisions. For example, a car is coming at you, you need to swerve to the left or the right. It doesn't need to be about what's the best method to use to make decisions. We do good enough and then we stop because it would take a lot of time.