Sidney Graham Winter (born 1935, in Iowa City, Iowa) is an American economist and Professor Emeritus of Management at the Wharton School, University of Pennsylvania. He is recognized as a leading figure in the revival of evolutionary economics. In 1982, he co-published with Richard R. Nelson An Evolutionary Theory of Economic Change, a book which has since been cited nearly 25,000 times. Winter was Chief Economist of the US General Accounting Office (1989-1993). He won the Viipuri Prize for Strategic Management in 2008. Winter was the second husband and widower of economist Alice Mitchell Rivlin.

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