Widely attributed to Friedman, and sometimes cited as being in his work Capitalism and Freedom (1962) this is also attributed to Alfred P. Sloan, sometimes with citation of a statement of 1964, but sometimes with attestations to his use of it as a motto as early as 1923.
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The rule of my life is to make business a pleasure and pleasure my business.
Attribution
Quote text and notes from Wikiquote: Milton Friedman (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.