It is a commonly held belief that, in 1936, Keynes' General Theory ushered in a new era in economic thought, with faith in the free market being replaced by reliance on systematic government intervention as a means of keeping the economy on an even keel. This book surveys the writings of a large number of economists in the interwar years and argues that the "Keynesian Revolution" is a myth, and that the "new economics" was a careful and selective synthesis of an "old economics" that had been developing for twenty years or more.