A simple New-Keynesian model is set out with AS-AD graphical analysis. The model is consistent with modern central banking, which targets shortterm nominal interest rates instead of money supply aggregates. This simple framework enables us to analyze the economic impact of productivity or markup...

Strong evidence now exists both in macro and micro data that price/wage durations are depent on the state of the economy and especially inflation. We embed this dependence in a macro model of the US that otherwise does well in matching the economy s behaviour in the last three decades; it now...

I study a class of macroeconomic models in which all firms can costlessly choose any price at each date from an interval (indexed to last period's price level) that includes a positive lower bound. I prove three results that are valid for any such half‐closed interval (regardless of how near...