Using data on adult male workers we first investigate the
incremental effect of a year of schooling on unemployed hours,
and use this calculation to explain the difference in the pro-
portional effects of schooling on earnings and wages. Schooling
apparently reduces unemployed hours by reducing the incidence of
unemployment spells, but it does not significantly affect their
duration. We next test whether unemployed hours represent
real constraints on worker behavior. To do this we develop
and estimate life—cycle models of labor supply for workers with
and without spells of unemployment using longitudinal data. The
results imply that perhaps three-quarters of the unemployed hours
of male workers are part of the offer to sell labor.