This chapter assesses how models with search frictions have shaped our understanding of aggregatelabor market outcomes in two contexts: business cycle fluctuations and long-run (trend) changes. Wefirst consolidate data on aggregate labor market outcomes for a large set of OECD countries. We...

This essay provides a survey of various models that use search theory to analyze labor markets. By search theory, we mean a framework in which trading frictions are modeled explicitly. Search models generate unemployment as an equilibrium outcome, and also allow us to discuss various ways in...