Milton Friedman has argued that the economic freedom of competitive capitalism is a requisite of political freedom. Friedman argued that centralized control of economic activity is always accompanied by political repression. In his view, transactions in a market economy are voluntary, and the wide diversity that voluntary activity permits is a fundamental threat to repressive political leaders and greatly diminish power to coerce. Friedman's view was also shared by Friedrich Hayek and John Maynard Keynes, both of whom believed that capitalism is vital for freedom to survive and thrive.
Ayn Rand was a prominent philosophical supporter of laissez-faire capitalism; her novel Atlas Shrugged was one of the most influential publications ever written on the subject of business. The first person to endow capitalism with a new code of morality (Rational Selfishness), she did not justify capitalism on the grounds of pure "practicality" (that it is the best wealth-creating system), or the supernatural (that God or religion supports capitalism), or because it benefits the most people, but maintained that it is the only morally valid socio-political system because it allows people to be free to act in their rational self-interest.
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