We propose that the natural rate of unemployment has an active role in the business cycle, in contrast to the … Phillips-curve framework of low---often extremely low---response of inflation to unemployment could be the result of fairly … most Phillips-curve studies, that conclude that inflation has little relation to unemployment. We suggest that the flat …

In recessions, unemployment increases despite the--perhaps counterintuitive--fact that the number of unemployed workers … finding jobs expands. We propose a theory of unemployment fluctuations resting on this countercyclicality of gross flows from … unemployment into employment. In recessions, the abundance of new hires "congests" the jobs the unemployed fill--diminishing their …