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newerspeak comments on The Irrationality Game - Less Wrong
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No, because preferences are revealed by behavior. Using revealed preferences is a good heuristic generally, but it's required if you're right that explanations for behavior are mostly post-hoc rationalizations.
So:
People eat what they prefer. What they prefer is what they wind up having eaten. Ergo, people eat what they eat.
Consistency of preferences is at least some kind of a prediction.