Sixty years ago, Milton Friedman questioned the usefulness of the optimal control approach because of policymakers’ imperfect knowledge of the economy and favored instead a simple rule approach to monetary policy (1947, 1948). These are still live issues, despite the development of powerful techniques ...

The conduct of monetary policy in terms of interest rate or other rules has been extensively studied in recent research. This literature gives a central role to forecasts of future inflation and output, and the question of whether monetary policy should be forward- ooking has been subject to discussion ...