This carefully crafted book discusses a wide range of important legal principles such as procedural fairness and reasonableness in the context of international trade and investment law. Using comparative methodology, the authors examine how those principles are reflected in treaties and how they are employed by adjudicators resolving disputes. Contributing to a growing and important body of scholarship, Principles of International Trade and Investment Law provides critical analysis of important topics in international economic law, including cross-border data transfers and prudential regulation. By identifying commonalities and divergences in how the two regimes treat key legal concepts, such as necessity testing and non-discrimination, the book provides insight into international trade and investment law while also furthering our understanding of the broader fields of international economic law and public international law. Examining how these key principles are interpreted and used in international economic law, this book will be welcomed by academics and practitioners interested in international investment and trade law as well as researchers in the international public law field.