Central Bank in the implementation of monetary policy, we must not only consider the long-term effects, but should also consider their short-term effect. For example, from the long-term effects, price stability and efforts to maximize output and employment efforts are complementary, but in the short term, there will be between certain contradictions. Sometimes the economy will face adverse supply shocks, such as agriculture in poor harvests, or is a significant fluctuations in oil supply. Formation of these shocks will be upward pressure on prices, output and employment on the formation of the pressure drop. In such circumstances, the central bank must decide is more concerned about slow upward pressure on prices, or more to take measures to reduce output and employment rate of decline.
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