Burdens and Balancing in Multisided Markets: The First Principles Approach of Ohio v. American Express

  • Joshua D. Wright
  • John M. YunEmail author


Multisided platforms have distinct and critical features that set them apart from single-sided markets. This realization has led to a split among courts, antitrust practitioners, and economists as to the best method to assess whether mergers or conduct that involve platforms result in the creation or maintenance of monopoly power and violate the antitrust laws. Some argue that each side of a platform constitutes a separate relevant product market. Others argue for a single, integrated market that incorporates all sides. We argue that any prima facie antitrust assessment of competitive harm must incorporate the impact to consumers on all sides regardless of market definition. We also explain why output effects should be the primary emphasis of competitive effects analyses. The Supreme Court recently and correctly adopted this approach in Ohio v. American Express.


Multisided platforms Two-sided markets Antitrust 



We thank Lawrence White and Thomas Lenard for very helpful comments, and Jay Kaplan for excellent research assistance.


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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Antonin Scalia Law SchoolGeorge Mason UniversityArlingtonUSA

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