Private defense agency

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Works The Market for Liberty (1970) For a New Liberty (1973) The Machinery of Freedom (1973) Defending the Undefendable (1976) The Ethics of Liberty (1982) To Serve and Protect (1998) Democracy: The God That Failed (2001) The Myth of the Rational Voter (2007) The Voluntary City (2002) The Problem of Political Authority (2012)
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A private defense agency (PDA) is a theoretical enterprise which would provide personal protection and military defense services to individuals who would pay for its services. PDAs are advocated in anarcho-capitalism as a way of enforcing the system of private property.^[1]

A PDA is distinguished from a private contractor employed by a state which is usually subsidized. Instead, such agencies would in theory be financed primarily by competing insurance and security companies.