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… is from page 150 of Ludwig von Mises [2]’s 1951 essay “Profit and Loss [3],” as reprinted in the 2008 Liberty Fund edition of Mises’s 1952 collection, Planning for Freedom [4]:
An entrepreneur earns profit by serving the consumers, the people, as they are and not as they should be according to the fancies of some grumbler or potential dictator.