Phillips curves are central to discussions of inflation dynamics and monetary policy. The hybrid new Keynesian Phillips curve (NKPC) describes how past inflation, expected future inflation, and a measure of real aggregate demand drive the current inflation rate. This paper studies the...

What explains the widespread fear of deflation? This paper reviews the history of thought, economic history, and empirical evidence on deflation, with a view to answering this question. It also outlines informally the main effects of deflation in applied monetary models. The main finding is that...