Antitrust Chronicle® – Ohio v. American Express: A Year Later…

Dear Readers,

On June 25, 2018, the Supreme Court sided in a 5-4 decision with American Express in a lawsuit over rules it imposes on merchants who accept its cards. The Supreme Court’s decision in Ohio v. American Express addressed a number of important issues concerning multisided platforms: for instance, whether each side of a platform is a separate relevant product market and whether a prima facie assessment of competitive harm must incorporate the impact to consumers on all sides of a pla