A number of hypotheses have been proposed to account for the role of lagged inflation in the New Keynesian price-adjustment model: (1) In the aftermath of abrupt structural change, rational learning may appear adaptive. (2) The model may have a serially correlated error term. (3) Estimating the...

The Phillips curve has been much flatter in the past twenty years than in the preceding decades. We consider two hypotheses. One is that prices at the microeconomic level are stickier than they used to be---in the context of the canonical Calvo model, firms are adjusting prices less often. The...

Over the past forty years, U.S. inflation has exhibited highly persistent movements. Moreover, these shifts in inflation have typically had real consequences, implying a "sacrifice ratio," whereby disinflations are typically associated with recessions and persistent increases in inflation often...