Firms compete with prices and qualities in markets where consumers have heterogeneous preferences and cost characteristics. Consumers demand two goods, which can be supplied jointly or separately by firms. We consider two strategy regimes for firms: uniform price-quality pairs, and screening...

In this article, we study the optimal regulation of a dominant firm when an unregulated firm actively competes. Generally, the existence of an active rival imposes new and binding constraints on regulatory problems. We characterize optimal policies both when demands are known (complete...

We examine the consequences of allowing a bottleneck input supplier to vertically integrate downstream and compete with users of the input when the input has a regulated price above cost. If the supplier maximizes the sum of short-run profits from the downstream market and input market, then...

We study the dynamics of price regulation for an industry adjusting to exogenous technological progress. First, we characterize the optimal capacity path and replacement cycles in a neoclassical investment model. Second, we show that naive rate-of-return regulation, which ignores components of...

We study an incentive auction in which multiple principals bid for the exclusive services, or effort, of a single agent. Each principal has private information about her valuation for these services, and the agent has private information about his disutility of providing them. We characterize...

I show that a middleman can be welfare improving in all equilibria in a quite general bargaining model when adverse selection is present. Conditions are determined for when a middleman is most likely to be in a market. Examples of the theory are also presented.