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Richard Posner’s retirement after 36 years on the federal bench presents an ideal opportunity to reflect on his sometimes controversial career as a scholar and a judge. Since his principal scholarly work, Economic Analysis of Law, has been cited in legal scholarship over 7500 times a good working hypothesis is that his impact on law has been substantial. This article considers his impact on contract law. Two lines of research were conducted: one line explores the impact of Judge Posner’s scholarly writings on judicial opinions; the other line examines the impact of his opinions on other courts.