Multisided Platforms in Antitrust Practice

16 Pages Posted: 30 Oct 2023

See all articles by David S. Evans

David S. Evans

Market Platform Dynamics; Berkeley Research Group, LLC

Date Written: October 18, 2023


The pioneering paper on the economics of two-sided platforms started circulating as a working paper around 2000 and soon after economists saw the import for antitrust analysis. The competition authorities and courts eventually did too. In the United States the Supreme Court’s decision in State of Ohio et al. v. American Express enunciated a framework for applying platform economics to key areas of antitrust. This paper describes that framework and how the courts have applied it in decisions on motions to dismiss, summary judgment, and liability through September 2023. It thereby provides a brief summary of how the economics of multisided platforms has been used in practice.

Keywords: Antitrust and platforms; two-sided markets; market definition for two-sided platforms; American Express decision; antitrust economics of two-sided platforms; platform economics and antitrust separated

JEL Classification: L13, L22, L4, L41, L42,L40, K21

Suggested Citation

Evans, David S., Multisided Platforms in Antitrust Practice (October 18, 2023). Available at SSRN: or

David S. Evans (Contact Author)

Market Platform Dynamics ( email )

140 South Dearborn St.
Chicago, IL 60603
United States

Berkeley Research Group, LLC ( email )

99 High St.
Boston, MA 02110
United States


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