In a number of interesting environments, dynamic screening involves positive selection: in contrast with Coasian dynamics, only the most motivated remain over time. The paper provides conditions under which the principal's commitment optimum is time consistent and uses this result to derive testable predictions under permanent or transient shocks. It also identifies environments in which time consistency does not hold despite positive selection, and yet simple equilibrium characterizations can be obtained.

To analyze the impact of labor market competition on the structure of compensation, we embed multitasking and screening within a Hotelling framework. Competition for talent leads to an escalation of performance pay, shifting effort away from long-term investments, risk management, and cooperation. Efficiency losses can exceed those from a single principal, who dulls incentives to extract rents. As competition intensifies, monopsonistic underincentivization of low-skill agents first decreases and then gives way to growing overincentivization of high-skill ones. Aggregate welfare is thus hill-shaped, while inequality tends to rise monotonically. Bonus caps can help restore balance in incentives but may generate other distortions.

This paper develops a normative model of regulatory policy toward bypass and cream skimming. It analyzes the effects of bypass on second-degree price discrimination, on the rent of the regulated firm, and on the welfare of low-demand customers. It shows that pricing under marginal cost may be optimal for the regulated firm, excessive cream skimming occurs if access to the bypass technology is not regulated, and the prohibition of bypass may increase or decrease the regulated firm's rent.

Game theory has had a deep impact on the theory of industrial organization, in a similar (but less controversial) way as the rational expectations revolution in macroeconomics. The reason it has been embraced by a majority of researchers in the field is that it imposes some discipline on theoretical thinking. It forces economists to clearly specify the strategic variables, their timing, and the information structure faced by firms. As is often the case in economics, the researcher learns as much from constructing the model (the extensive form) as from