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But that is not the reason to deny that such knowledge is not simply based on observation but also on experience. Minnesota wild heart stethoscope. A grocery store owner opening a new store must also rely on some social experience; and then even a person standing in line to buy tickets to the theater also gained a bit of experimental technological knowledge to use for the next queue, which is also social experiment. And we should not forget that only practical experience can teach sellers and shoppers lessons about price fluctuations when stock is redundant or scarce.