This study distinguishes between the information in the Ou and Penman (1989a) Pr measure and that in analysts' forecasts of earnings. For cases where analysts' forecasts are available, trading on Pr produces abnormal returns only when the predictions of Pr and those of analysts' forecasts disagree. This is consistent with Pr capturing some information not impounded in market prices. However, abnormal returns to this trading strategy continue for up to 72 months after the release of the data necessary to compute Pr. This is consistent with Pr proxying for the effects of omitted risk factors.

Preunemployment search is the fundamental labor market process generating beneficial effects of advance notice. Yet theory indicates that workers receiving notice may not search, whereas others may search even without advance notice. Our weighted results indicate that over one-third of all nonnotified workers still search and over 40% of workers receiving notice do not respond by searching. Further, preunemployment search determinants differ for notified (nonnotified) workers and men (women). For notified men, search is strongly increased by longer notice and strongly decreased by higher unemployment insurance benefits. But neither factor affects the employed search decisions of notified women.

This paper analyzes the optimal financial structure for a firm in which the top manager must provide incentives to a subordinate in addition to exerting directly productive efforts. Optimal capital structure is shown to involve a moderate level of debt with a substantial penalty for default, and passive shareholders. In a two- or three-layer hierarchy, optimal leverage is shown to decrease as either the number of hierarchical levels or the importance of agents further down the hierarchy increases. This and other implications of the model square well with existing evidence and suggest new directions for empirical work.

An oft-repeated goal in many contexts is the "preservation of diversity." But what is the diversity function to be optimized? This paper shows how a reasonable measure of the "value of diversity" of a collection of objects can be recursively generated from more fundamental information about the dissimilarity-distance between any pair of objects in the set. The diversity function is shown to satisfy a basic dynamic programming equation, which in a well-defined sense generates an optimal classification scheme. A surprisingly rich theory of diversity emerges, having ramifications for several disciplines. Implications and applications are discussed.

This paper investigates the effect of increased import competition on U. S. manufacturing employment and wages, using data for a panel of manufacturing industries over the 1977–1987 period. The empirical analysis uses previously unavailable industry import price data and an instrumental variables estimation strategy. The estimates suggest that changes in import prices have a significant effect on both employment and wages. The dramatic appreciation of the dollar between 1980 and 1985 is estimated to have reduced wages by 2 percent, and employment by 4.5–7.5 percent on average in this sample of trade-impacted industries.

This paper analyzes empirically for the years 1980-1988 the factors that led states with state income taxes to run tax amnesty programs. We find that the potential yield from an amnesty is more important than the fiscal status of a state. Furthermore, we estimate that if the 1RS audit rate had remained constant during the 1980–1988 period (instead of falling by almost one half), then the cumulative probability that an average state would have had a tax amnesty by 1988 would have fallen by just over 25 percent.