
Keynes's theory was chosen as the official response to the states of Western economic theory of crisis and depression. For the first time spread the belief in a system Economic hit by periodic crises. The economic recessions alternated with those of depression, the economy could not, therefore, to ensure full employment. According to Keynes the system found its impasse in the investment industry. The price of bonds is inversely related to money market interest: P = V / i
short-term investments were consistent. Individuals could use their savings mainly by buying securities. In the situation where interest rates are low investors begin to expect a future rise in interest rates and lower bond prices. Will therefore tend not to buy new titles and holding money. The preference liquidity throws the system into a long depression, the phenomenon is also called "liquidity trap".
As mentioned earlier, Keynes took a little variable and constant investment in the short term. The savings were therefore subject to stable equilibrium of underemployment to exit from which it was necessary for public intervention to boost demand. She was born the 'Keynesian policy' and the lever of public spending became a sort of panacea to the ills of economic depression and underemployment of resources.
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