I think you're conflating different definitions of "rational." Economics models trends. Throwing away your money on sports betting isn't "rational" if you want to put a value judgment on it, but millions of people do it, and you can be damn sure it can be modeled economically.
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u/monkwrenv2 5h ago
Probably the biggest failure in economics is the assumption that rational actors exist, much less are the majority of economic entities.