Antitrust & Competition Policy Blog

Editor: D. Daniel Sokol
University of Florida
Levin College of Law

Thursday, July 2, 2020

Consumer Information and the Limits to Competition

By: Mark ArmstrongJidong Zhou
Abstract: This paper studies competition between firms when consumers observe a pri-vate signal of their preferences over products. Within the class of signal structures which allow pure-strategy pricing equilibria, we derive signal structures which are optimal for firms and those which are optimal for consumers. The firm-optimal signal structure amplifies the underlying product differentiation, thereby relax¬ing competition, while ensuring that consumers purchase their preferred product, thereby maximizing total welfare. The consumer-optimal structure dampens dif¬ferentiation, which intensifies competition, but induces some consumers with weak preferences between products to buy their less-preferred product. The analysis sheds light on the limits to competition when the information possessed by con¬sumers can be designed flexibly.
Keywords: Information design, Bertrand competition, product differentiation, online platforms
JEL: D43 D47 D83 L13 L15
Date: 2019–11–28

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