Most recent studies on transnational private regulation have limited themselves to the examination of a single regime, industry or sector. This book fills a gap in the current literature, offering a rich comparative study of the institutional design of transnational private regulation in the fields of advertising and food safety. The author provides original insights in the practice of enforcing transnational private regulation and its interplay with courts and administrative authorities. The book's findings, drawn from jurisdictions in the European Union, help identify circumstances in which administrative enforcement may strengthen private enforcement mechanisms, illuminate the role of courts in enforcing transnational private regulation, and inform current theoretical understandings of the function of public enforcement capacity in private regulatory regimes. This book will appeal to scholars and students of regulation and enforcement, as well as policy makers and lawmakers concerned with advertising and food safety regulation.