It is well known that comparative performance information can enhance efficiency in static principal-agent relationships by improving the trade-off between insurance and incentives in the design of explicit contracts. In dynamic settings, however, there may be implicit as well as explicit incentives, for example, managerial career concerns and the ratchet effects in regulation. The authors show that the dynamic effects of comparative performance information on implicit incentives can either reinforce or oppose the familiar (static) insurance effect and in either case can be more important for efficiency. The overall welfare effects of comparative performance information are thus ambiguous and can be characterized in terms of the underlying information structure.

Edgeworth’s paradox of taxation occurs when an increase in the unit cost of a product causes a multiproduct monopolist to reduce prices. We give simple illustrations of the paradox and a general analysis of the case of linear marginal cost and demand conditions, and we characterize which matrices of cost pass-through terms are consistent with profit maximization. When the firm supplies at least one pair of substitute products, we show how Edgeworth’s paradox always occurs with a suitable choice of cost function. We then establish a connection between Ramsey pricing and the paradox in a form relating to consumer surplus.

We study multiproduct firms in the contexts of unregulated monopoly, regulated monopoly, and Cournot oligopoly. Using the concept of consumer surplus as a function of quantities (rather than prices), we present simple formulas for optimal prices and show that Cournot equilibrium exists and corresponds to a Ramsey optimum. We then discuss a tractable class of preferences that involve a generalized form of homotheticity. Profit-maximizing quantities are proportional to efficient quantities. We discuss optimal monopoly regulation when the firm has private information about its cost vector and find situations in which optimal regulation leaves relative price decisions to the firm.