This paper studies the processes of wage and employment dynamics within local labor markets. The theoretical context is a dynamic spatial equilibrium among locales that is supported by incentives to migrate to markets offering the greatest present value of future earnings. Thus costly migration arbitrages geographic wage differences. Using a time series of cross-sectional files from the Current Population Surveys of 1977-79, I find that wages are sensitive to interarea differences in market conditions. A positive relative shock to local labor demand increases relative wages within a locale, but expectations of future demand actually reduce current wages because of increased current migration. Thus wages are more flexible in response to transitory changes in local market conditions than to permanent ones. Consistent with theory, wages are most flexible among the least mobile demographic groups, who are inelastically supplied across geographic areas.

Objective measures of employee performance are rarely available. Instead, firms rely on subjective judgments by supervisors. Subjectivity opens the door to favoritism, where evaluators act on personal preferences toward subordinates to favor some employees over others. Firms must balance the costs of favoritism--arbitrary rewards and less productive job assignments--against supervisors' demands for authority over subordinates. The authors analyze the conditions under which favoritism is costly to organizations and the effects of favoritism on compensation, the optimal extent of authority, and the use of bureaucratic rules.

We develop a framework for valuing improvements in health and apply it to past and prospective reductions in mortality in the United States. We calculate social values of (i) increased longevity over the twentieth century, (ii) progress against various diseases after 1970, and (iii) potential future progress against major diseases. Cumulative gains in life expectancy after 1900 were worth over $1.2 million to the representative American in 2000, whereas post-1970 gains added about $3.2 trillion per year to national wealth, equal to about half of GDP. Potential gains from future health improvements are also large; for example, a 1 percent reduction in cancer mortality would be worth $500 billion.

We analyze entry, pricing, and product design in a model with differentiated products. Market equilibrium can be “separating,” with multiple sellers and a sorting of heterogeneous consumers across goods, or “exclusionary,” with one seller serving all customer types. Entry into an initially monopolized market can occur because of cost reductions or product improvements, but entry need not lower the incumbent’s price, improve efficiency, or raise consumer welfare. Postentry design incentives favor a softening of price competition and stronger market segmentation, whereas exclusionary design changes typically raise consumer welfare. Potential, as distinct from actual, entry always benefits consumers.