Capitalism and Freedom is a book by Milton Friedman originally published in 1962 which discusses the role of economic capitalism in liberal society. In accessible, jargon-free language, Friedman makes the case for economic freedom as a precondition for political freedom. He defines liberal in European Enlightenment terms, contrasting with an American usage that he believes has been corrupted since the Great Depression. Many North Americans usually categorized as conservative or libertarian have adopted some of his views. The book finds several realistic places in which a free market can be promoted for both philosophical and practical reasons, with several surprising conclusions. Among other concepts, Friedman advocates ending the mandatory licensing of doctors and introducing a system of vouchers for school education.