On the one hand, the central bank’s legitimacy among the general public could suffer if short-term interest rates have to move sharply, causing output to fluctuate widely while inflation is held stable and exactly on the target. Maximum stability in output could, on the other hand, result in sharp fluctuations in the rate of inflation and erode the credibility of the monetary regime. A point somewhere midway between the two extremes must therefore be found. Let me also stress the importance of central bank independence. In order to be successful with the implementation of an inflation target approach, the central bank must be able to act independently of day-to-day party politics and to set interest rates continuously according to the specified inflation target. Otherwise a credibility problem arises because it will be hard for policymakers to convince the general public of monetary policy’s long-term nature. Lack of credibility, in turn, means that the central bank has to set its interest rates higher than otherwise would have been the case. Looking ahead, I believe there are at least two major questions that central banks have to address more thoroughly. First, how should monetary policy react to asset prices, such as equity and/or real estate prices? We know from history that the development of asset prices can have a significant impact on both inflation and real economic activity.
If asset prices have been driven up to unsustainable levels that do not correspond to the underlying fundamentals, we are faced with a special kind of problem. We know from experience that speculative asset price bubbles eventually burst. When they do, collateral values will fall and balance sheets deteriorate, potentially threatening the stability of the banking system. To avoid this kind of development, the central bank needs to closely monitor the potential for excessive credit growth and the possibility of asset price bubbles building up. It seems that historically the forming of speculative price bubbles has been closely linked to an excessive expansion of credit. But we need to operationalise both the concept “excessive” and the difficult concept of an asset’s “fundamental value”. As history has shown us, judging to what extent rising asset prices reflect strong fundamentals, rather than the “irrational exuberance” of investors, is easier said than done. Nevertheless, certain important risks related to asset prices need careful watching in today’s world. The first risk is that imprudent lending could fuel unwarranted asset price increases - as so often in the past. Although there is little evidence to date of a general lowering of credit standards, credit growth has been very rapid and loans to finance equity purchases have risen sharply in some countries. BIS Review 65/2000  4  Ensuring that investors are not sheltered from the consequences of their sometimes misguided investments is important for maintaining prudent lending standards.