The construction of an economic model, or of any model or theory for that matter (or the writing of a novel, a short story, or a play) consists of snatching from the enormous and complex mass of facts called reality, a few simple, easily-managed key points which, when put together in some cunning way, become for certain purposes a substitute for reality itself.

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