Equilibrium models of labor markets characterized by search and recruiting friction and by the need to reallocate workers from time to time across alternative productive activities represent the segment of the research frontier explored in this chapter. In this literature, unemployment spell and...

Microeconomic data on individual firms and employer-employee matches reveal substantial and persistent dispersion in firm size, productivity, and average wage paid and a positive correlation between each pair. To the extent that intrinsic differences in firm productivity explain these facts,...