Briefing on the Supreme Court’s ruling that Mastercard and Visa’s multilateral interchange fees restrict competition contrary to Article 101. On 17 June 2020 the Supreme Court unanimously upheld an earlier Court of Appeal ruling that Mastercard and Visa’s multilateral interchange fees (MIFs) restricted competition contrary to Article 101(1), resolving several disputes between the card schemes and retailers that have run in the UK courts since as early as 2012, and have at times resulted in conflicting outcomes.