David Director Friedman is an American economist, physicist, legal scholar, and anarcho-capitalist theorist. Although he studied chemistry and physics and not law or economics, 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).

Anarcho-capitalism is an anti-statist, libertarian political philosophy and economic theory that seeks to abolish centralized states in favor of stateless societies with systems of private property enforced by private agencies, based on concepts such as the non-aggression principle, free markets and self-ownership. Anarcho-capitalist philosophy extends the concept of ownership to include control of private property as part of the self. In the absence of statute, anarcho-capitalists hold that society tends to contractually self-regulate and civilize through participation in the free market, which they describe as a voluntary society involving the voluntary exchange of goods and services. In a theoretical anarcho-capitalist society, the system of private property would still exist, as it would be enforced by private defense agencies and/or insurance companies selected by property owners, whose ownership rights or claims would be enforced by private defence agencies and/or insurance companies. These agencies or companies would operate competitively in a market and fulfill the roles of courts and the police, similar to a state apparatus.