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.

Using Tobin's q as a measure of performance, we seek to estimate the relative importance of industry, focus, and share effects in determining firm performance. Our methods are analogous to those of Richard Schmalensee and, like him, we find that industry effects account for the majority of the explained variance. However, we also find that firm effects exist in the form of focus effects, that is, narrowly diversified firms do better than widely diversified firms. We interpret this finding as consistent with profit maximization by firms with different factor endowments.

This paper develops a search-theoretic explanation of interindustry wage differentials. Given coordination problems in the labor market, the probability of filling a vacancy is an increasing function of the wage offered; in equilibrium, firms that find vacancies more costly will offer higher wages. The model thus explains the persistence of interindustry wage differentials and their correlation with industry-average capital-labor ratio and profitability. Additionally, the model predicts that high-wage firms will receive more applications per job opening and that wages in the labor market will behave as strategic complements.

Reviews the book "Cash Flow Accounting," edited by Barry E. Hicks and Pearson Hunt.

Reviews the book "Accounting: A Programmed Text," vol. 2, by James Don Edwards, Roger H. Hermanson and R.F. Salmonson.