Monetary policy is not the only force acting on output, employment, and prices. Many other factors affect aggregate demand and aggregate supply and, consequently, the economic position of households and businesses. Some of these factors can be anticipated and built into spending and other economic decisions, and some come as a surprise. On the demand side, the government influences the economy through changes in taxes and spending programs, which typically receive a lot of public attention and are therefore anticipated. For example, the effect of a tax cut may precede its actual implementation as businesses and households alter their spending in anticipation of the lower taxes. Also, forward looking financial markets may build such fiscal events into the level and structure of interest rates, so that a stimulative measure, such as a tax cut, would tend to raise the level of interest rates even before the tax cut becomes effective, which will have a restraining effect on demand and the economy before the fiscal stimulus is actually applied.

Other changes in aggregate demand and supply can be totally unpredictable and influence the economy in unforeseen ways. Examples of such shocks on the demand side are shifts in consumer and business confidence, and changes in the lending posture of commercial banks and other creditors. Lessened confidence regarding the outlook for the economy and labor market or more restrictive lending conditions tend to curb business and household spending.

In practice monetary policy makers do not have up to the minute information on the state of the economy and prices. Useful information is limited not only by lags in the construction and availability of key data but also by later revisions, which can alter the picture considerably. Therefore, although monetary policy makers will eventually be able to offset the effects that adverse demand shocks have on the economy, it will be some time before the shock is fully recognized and (given the lag between a policy action and the effect of the action on aggregate demand) an even longer time before it is countered. Add to this the uncertainty about how the economy will respond to an easing or tightening of policy of a given magnitude, and it is not hard to see how the economy and prices can depart from a desired path for a period of time.

The statutory goals of maximum employment and stable prices are easier to achieve if the public understands those goals and believes that the Federal Reserve will take effective measures to achieve them. For example, if the Federal Reserve responds to a negative demand shock to the economy with an aggressive and transparent easing of policy, businesses and consumers may believe that these actions will restore the economy to full employment; consequently, they may be less inclined to pull back on spending because of concern that demand may not be strong enough to warrant new business investment or that their job prospects may not warrant the purchase of big ticket household goods. Similarly, a credible anti inflation policy will lead businesses and households to expect less wage and price inflation; workers then will not feel the same need to protect themselves by demanding large wage increases, and businesses will be less aggressive in raising their prices, for fear of losing sales and profits. As a result, inflation will come down more rapidly, in keeping with the policy related slowing in growth of aggregate demand, and will give rise to less slack in product and resource markets than if workers and businesses continued to act as if inflation were not going to slow.

Limitations of Monetary Policy

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