David Director Friedman (; born February 12, 1945) is an American economist, physicist, and legal scholar. He is known for his textbook writings on microeconomics and the libertarian theory of anarcho-capitalism, which is the subject of his most popular book, ''The Machinery of Freedom''. Described by Walter Block as a "free-market anarchist" theorist, Friedman has also authored several other books and articles, including ''Price Theory: An Intermediate Text'' (1986), ''Law's Order: What Economics Has to Do with Law and Why It Matters'' (2000), ''Hidden Order: The Economics of Everyday Life'' (1996), and ''Future Imperfect'' (2008).
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