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Monetary economics is a major branch of macroeconomics.[1] It provides a framework for examining the relation between economic activity and money in its functions as a medium of exchange, store of value, and unit of account.[2] It considers the respective advantages of broad or narrow definitions of the money supply in explaining economic activity. It studies the effects of changes in the supply of or demand for money on interest rates, nominal and real output and the price level of an economy.[3]
Since 1990, the classical form of monetarism has been questioned because of events which many economists have interpreted as being inexplicable in monetarist terms, namely the unhinging of the money supply growth from inflation in the 1990s and the failure of pure monetary policy to stimulate the economy in the 2001-2003 period. Alan Greenspan, former chairman of the Federal Reserve, argued that the 1990s decoupling was explained by a virtuous cycle of productivity and investment on one hand, and a certain degree of "irrational exuberance" in the investment sector. Economist Robert Solow of MIT suggested that the 2001-2003 failure of the expected economic recovery should be attributed not to monetary policy failure but to the breakdown in productivity growth in crucial sectors of the economy, most particularly retail trade. He noted that five sectors produced all of the productivity gains of the 1990s, and that while the growth of retail and wholesale trade produced the smallest growth, they were by far the largest sectors of the economy experiencing net increase of productivity. "2% may be peanuts, but being the single largest sector of the economy, that's an awful lot of peanuts."
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