Rothbard is surely right in thinking that what we now call free-market libertarianism was originally a left-wing position. The great liberal economist Frédéric Bastiat sat on the left side of the French national assembly, with the anarcho-socialist Proudhon. Many of the causes we now think of as paradigmatically left-wing-feminism, antiracism, antimilitarism, the defense of laborers and consumers against big business-were traditionally embraced and promoted specifically by free-market radicals. ... I like calling the free market a left-wing idea-in fact, I like calling libertarianism the proletarian revolution.