of Communism, but ultimately a form of Keynesian economics became mainstream; see textbooks of the Keynesian revolution. The Keynesian revolution has been criticized on a number of grounds: some, particularly the freshwater school and Austrian school, argue that the revolution was misguided and incorrect; by contrast, other schools of Keynesian economics, notably Post-Keynesian economics, argue that the "Keynesian" revolution ignored or distorted many of Keynes's fundamental insights, and did not go far enough. Theory of employment A central aspect of the Keynesian revolution was a change in theory concerning the factors determining employment levels in the overall economy. The revolution was set against the orthodox classical economic framework, and its successor, neoclassical economics, which, based on Say's Law, argued that unless special conditions prevailed, the free market would naturally establish full employment equilibrium with no need for government intervention. This view held that employers will be able to make a profit by employing all available workers as long as workers drop their wages below the value of the total output they are able to produce – and classical economics assumed that in a free market workers would be willing to lower their wage demands accordingly, because they are rational agents who would rather work for less than face unemployment. Keynes argued that both Say's Law and the assumption that economic actors always behave rationally are misleading simplifications, and that the classical economics was only reliable at describing a special case. The Keynesian Revolution replaced the classical understanding of employment with Keynes's view that employment is a function of demand, not supply. Peter Drucker said: He had two basic motivations. One was to destroy the labor unions and the other was to maintain the free market. Keynes despised the American Keynesians. His whole idea was to have an impotent government that would do nothing but, through tax and spending policies, maintain the equilibrium of the free market. Keynes was the real father of neoconservatism, far more than Hayek! Other "revolutions" in economics Prior to Keynes Professor Harry Johnson has written that economics in its modern form can be seen as dawning with the Smithian Revolution against mercantilism. Prior to Keynes there were five other major developments in economic thought rapid enough in pace to be characterised as revolutions, most notably the Ricardian. Another noted revolution is the marginalist revolution, which is taken to mark the transition from classical economics to neoclassical