"In order to understand the situation into which we have been led, it will be necessary to take a brief look at the intellectual sources of the full-employment policy of the "Keynesian" type. The development of Lord Keynes's theories started from the correct insight that the regular cause of extensive unemployment is real wages that are too high. The next step consisted in the proposition that a direct lowering of money wages could be brought about only by a struggle so painful and prolonged that it could not be contemplated. Hence he concluded that real wages must be lowered by the process of lowering the value of money. This is really the reasoning underlying the whole "full employment" policy, now so widely accepted. If labor insists on a level of money wages too high to allow of full employment, the supply of money must be so increased as to raise prices to a level where the real value of the prevailing money wages is no longer greater than the productivity of the workers seeking employment. In practice, this necessarily means that each separate union, in its attempt to overtake the value of money, will never cease to insist on further increases in money wages and that the aggregate effort of the unions will thus bring about progressive inflation."