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Eighteenth-century economist Adam Smith is famed for his metaphor of the invisible hand, which he putatively used to illustrate a robust model of how individuals produce aggregate benefits by pursuing their own economic interests. Note "putatively": as Gavin Kennedy has shown, Smith deploys this metaphor only once in his economic writings to make a narrow point about the then-dominant economic theory of mercantilism-and it was largely ignored until some twentieth-century economists eager to secure an intellectual pedigree for their views elevated it to a fully-fledged paradigm.