The proposed Digital Markets Act (DMA) is an opportunity to prevent and remedy anti-competitive conduct by large digital platforms. If the Act is designed in an adequate manner to target specific problems, it can improve the contestability of platform services markets and markets that rely...

Introduction -- Which horizontal agreements are illegal? -- What unilateral conduct is illegal? -- Vertical agreements that restrict dealing with rivals -- Distorting downstream distribution of a supplier's products -- Proving an agreement or concerted action -- Mergers and acquisitions --...