Competition Law explains competition law and policy in the EU and UK. The intention is to provide the reader with an understanding of competition law and policy, to introduce the reader to key economic concepts, legal principles and tools in competition law, and to provide insights into the numerous different issues that arise when applying competition law to market behaviour. Describing the economic rationale for the law, the chapters consider the application of EU and UK competition law to various business practices, including cartels, cooperation agreements, distribution agreements, licences of intellectual property rights, joint ventures, and mergers. The text has been updated to include the changes to UK law as a consequence of Brexit. It discusses for the first time the rise of powerful digital platforms and the quest for a suitable competition law and regulatory response to this phenomenon. It also considers the implications of the European Green Deal and the sustainability agenda for EU competition law and practice. The text incorporates extensive new legislation, case-law, decisional practice, guidelines and periodical literature at EU and UK level.