Economic crisis in the 20 and the 30 showed limitations of the Neoclassical belief in a market and in the reliability of a market factor. At the same time it eviscerated the fundaments of the liberal vision of a state hanging back from the real economic life. The opponent to the liberal vision of a state and the perfection of a market was John M. Keynes. According to him, the crisis of overproduction was a permanent quality of the monopolistic phase of capitalism. The only remedy to the wrongdoing was a state instruments affected the extent of the effective global demand, so the volume of output, the employment level and the national income.