For decades, textbooks have explained inflation behavior with Friedman (1968)’s Phillips curve: the inflation rate depends on expected inflation and the deviation of unemployment from its natural rate. Yet this theory has always been controversial, and skepticism has been rampant in the decade ...

The decade since 1990 has been a period of innovation in monetary policy. Around the world, many countries have adopted inflation targeting as their basic policy framework. Different countries have tried different techniques for achieving inflatio targets, such as different choices of policy instruments.