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Mmm, that's true but it's also true that people do behave in a way that can be mathematically modeled. For example, when prices go down people tend to buy more of a good, which can be modeled mathematically as a demand function.
Again, you speak of aggregates not individual people. Individual people make the aggregates. Have you found any models that work each and every time they are applied to a situation? If you are using statistics, then you can categorically state that if A then B and be correct in every case.
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