New Keynesian models of the business cycle have become the new paradigm of monetary economics, often used for policy analysis. This paper shows that this class of models fail in one crucial respect: they imply a strong negative contemporaneous correlation between inflation and output....

Modern monetary policy analysis is built around the concept of an interest rate rule that responds to both inflation and output. This paper evaluates the quantitative implications of having a policy rule target different definitions of the output gap in a New Keynesian model with endogenous...