The Ethics of Liberty is a 1982 book by American philosopher and economist Murray N. Rothbard, in which the author expounds a libertarian political position. Rothbard's argument is based on a form of natural law ethics, and makes a case for anarcho-capitalism.Hans-Hermann Hoppe's Introduction to the 1998 edition of the book says that it "explains the integration of economics and ethics via the joint concept of property; and based on the concept of property, and in conjunction with a few general empirical (biological and physical) observations or assumptions, Rothbard deduces the corpus of libertarian law, from the law of appropriation to that of contracts and punishment." Source: Wikipedia (en)