Adverse selection and employment cycles

This article examines a dynamic adverse-selection model that generates equilibrium employment cycles. In the model, firms hire workers from unemployment, observe workers' productivity through time, and (following the profit-maximizing rule) eventually fire unproductive workers. If hiring costs are low, the dynamical system converges to a steady state in which the unemployment pool contains mostly low-ability workers. However, if hiring costs are sufficiently large, this "lemons effect" would make firms unwilling to hire workers. In this case, the system converges to a cyclical equilibrium in which firms alternate between hiring and not hiring.