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Keynesian and Monetary Policy

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1)
Monetary policy is the manipulation of the money supply with the objective of affecting macroeconomic outcomes such as GDP growth, inflation, unemployment, and exchange rates. Monetary policy in the United States is conducted by the Federal Reserve, in particular, by the FOMC. Keynesian monetary policy focus on how changes in the money supply affect interest rates and investment spending. In turn, aggregate demand shifts and affects prices, real GDP, and employment. The Keynesian view of the monetary policy transmission mechanism operates as follows: First, the Fed uses its policy tools to change the money supply. Second, changes in the money supply change the equilibrium interest rate, which affects investment spending. Finally, a change in the investment changes aggregate demand and determines the level of prices, real GDP, and employment.
Since the 1950s, a new view of monetary policy, called monetarism, has emerged that disputes the Keynesian view that monetary policy is relatively ineffective. Monetarism is the simpler view that changes in monetary policy directly change aggregate demand, and thereby prices, real GDP, and employment. Thus, monetarists focus on the money supply, rather than on the rate of interest.

2)
Monetarism is the prevailed economic theory per 2008. This theory dominated in the 20 year period leading up to the 2008 economic crisis. Monetarism argues that the markets are self-correcting and self-regulated. It believes that capital market naturally tend towards efficiency and fair value. The market theory that goes along with monetarism is the Efficient Market Hypothesis (EMH) which believes that it is impossible to beat the market because all the relevant information is already reflected in the stock price. Monetarism and EMH have been criticized since 2008 because it is clearly not that case that capital market can correct by

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