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J O I N T C E N T E R
AEI-BROOKINGS JOINT CENTER FOR REGULATORY STUDIES
The Antitrust Economics of Two-sided Markets
David S. Evans
Related Publication 02-13
September 2002
David Evans is Senior Vice President, NERA Economic Consulting. The author is extremely grateful to
Howard Chang, George Priest, Jean-Charles Rochet, Richard Schmalensee, and Jean Tirole for many helpful comments and suggestions and Irina Danilkina, Anne Layne-Farrar, Daniel Garcia Swartz,
Bryan Martin-Keating, Nese Nasif, and Bernard Reddy for their many contributions to the research upon which article is based. The author has worked for a number of companies in the two-sided markets discussed in this paper including Bloomberg, Microsoft, and Visa. © David S. Evans 2002.
Abstract
“Two-sided” markets have two different groups of customers that businesses have to get on board to succeed—there is a “chicken-and-egg” problem that needs to be solved. These industries range from dating clubs (men and women), to video game consoles (game developers and users), to credit cards (cardholders and merchants), and to operating system software
(application developers and users). They include some of the most important industries in the economy. Two-sided firms behave in ways that seem surprising from the vantage point of traditional industries, but in ways that seem like plain common sense once one understands the business problems they must solve. Prices do not and prices cannot follow marginal costs in each side of the market. Price levels, price structures, and investment strategies must optimize output by harvesting the indirect network effects available on both sides. By doing so, businesses in two-sided industries get both sides on board and solve the chicken-and-egg problem. There is no basis for asking regulators or antitrust enforcers to steer clear of these industries or to

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