CEVAP:

The Keynesian theory argue that the economy is not always be at full employment equilibrium because flexible prices and wages are not always valid. According to this opinion, there are many factors that prevent wages and prices from being flexible. For this reason, markets are moving away from fully competitive structure. In some sectors the existence of firms that do not want to reduce prices may be the case. Prices in these sectors can remain at the same level for a long time instead of falling when there is a fall in demand or expenditure. Because of the existence of strong labor unions and long term wage contracts, the same is also true in labor markets.