The user of a theory has a simpler task: his not to reason why, his but to sigh and try. If the right element in the diverse situations has been isolated, the theory will work: it will yield predictions better than those which can be reached with any alternative theory.

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Quote text and notes from Wikiquote: George Stigler (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.