By: |
Armstrong, Mark;
Vickers, John |
Abstract: |
We study pricing by multiproduct firms in the context 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 present a tractable class of demand
systems that involve a generalized form of homothetic preferences. As well as
standard homothetic preferences, this class includes linear and logit demand.
Within the class, profit-maximizing quantities are proportional to efficient
quantities. We discuss cost-passthrough, including cases where optimal prices
do not depend on other products' costs. Finally, we discuss optimal monopoly
regulation when the firm has private information about its vector of marginal
costs, and show that if the probability distribution over costs satisfies an
independence property, then optimal regulation leaves relative price decisions
to the firm. |
Keywords: |
Multiproduct pricing, homothetic preferences, Cournot oligopoly, monopoly regulation, Ramsey pricing, cost passthrough, multidimensional screening |
JEL: |
D42 D43 D82 L12 L13 L51 |
Date: |
2016–01–08 |
URL: |
http://d.repec.org/n?u=RePEc:pra:mprapa:68717&r=ind |