This paper explains why a wave of in-migration reduces the employment rate of local workers, and why this reduction is larger in bad times. Yet, when the labor market is inefficiently tight, in-migration improves local welfare because it aids firms in recruiting.
This paper develops a model of unemployment fluctuations. The innovation is to represent the labor and product markets with a matching structure. The model simultaneously features Keynesian unemployment, classical unemployment, and frictional unemployment.
This paper proposes a matching model of the labor market with job rationing: unemployment does not disappear in the absence of matching frictions. In recessions, job rationing drives the rise of unemployment, whereas matching frictions contribute little to it.