However, from December, market expectations have approached the Riksbank’s forecasts (see Figure 4). So how can the gap between market expectations and the Riksbank’s repo rate forecasts in 2009 be explained? Some of the deviations may be explained, for example, by the possibility that statements on the lower bound of the repo rate were interpreted to mean that there were only upside risks for the repo rate, but this does not explain them all. A major part of the deviations thus remain to be explained. One possible explanation may be that money market participants have taken a more positive view of economic development. For example, they may have expected GDP growth and inflation to be higher in the future than stated in the Riksbank’s forecasts, and thus require a tighter monetary policy. However, this hypothesis is not supported by surveys of the expected economic development. These show that the money market participants expected both lower inflation and lower GDP growth in the period ahead than the Riksbank. 12 The market participants seem to have believed in a different reaction pattern from the Riksbank than that expressed in the repo-rate path. The disagreement among the members of the Executive Board may have contributed to this. At the monetary policy meetings in July, September, October and December, reservations against the published repo rate path were entered by members who considered that the repo rate path in 2010 should be slightly higher.
It is a question of choosing a repo-rate path so that the forecast for inflation and resource utilisation entails the best possible stabilisation of inflation and resource utilisation. As the forecasts play such a central role in the monetary policy decisions, it is of course important that the Riksbank employs good forecasting methods and uses all the relevant information available when the forecasts are produced so that they are as accurate as possible. An important step in the assessment of monetary policy is therefore to investigate whether the forecasts are reasonably accurate. One way to do this is to compare the Riksbank’s forecasts with those of other forecasters. The Riksbank makes such comparisons every year. Another component of the assessment of monetary policy is to analyse how predictable monetary policy is and what impact it has on market rates. Monetary policy mainly acts by influencing expectations regarding interest rates, inflation and the real economy in the future. Expectations regarding the repo rate in the years immediately ahead affect interest rates with  2  BIS Review 32/2010  longer maturities, and therefore inflation and the real economy, more than the repo rate in the period up to the next monetary policy decision. The predictability of monetary policy can be measured in terms of how well the market predicts the next repo-rate path. How effectively monetary policy steers market expectations and market rates can be measured in terms of how closely the market expectations regarding future repo rates correspond to the repo-rate path after it is published.