This paper examines, in light of the Lucas Critique, the behavior of the Phillips curve and of the term structure of interest rates after October 1979. It starts with an informal account of the policy change and then discusses how we might expect these two relations to shift after such a change....

50 years ago, Milton Friedman articulated the natural rate hypothesis. It was composed of two sub-hypotheses: First, the natural rate of unemployment is independent of monetary policy. Second, there is no long-run trade-off between the deviation of unemployment from the natural rate and...