This monograph began as a study of the consequences of labor force effects, in cluding unemployment, for the distribution of earnings. I began by developing a model of job search. But following my previous work on the distribution of earnings, the search theory took a different form from the standard literature. Workers and firms were engaged in mutual search which effectively assigned workers to jobs. A number of open questions immediately became apparent, including the relation bet ween unemployment and inequality, the nature and costs of unemployment, and the role of choice. These quickly...