The Formation and Identification of Rules of Customary International Law in International Investment Law

Patrick Dumberry provides a comprehensive analysis of the rules of customary international law in the field of international investment law.

Patrick Dumberry (Author)

9781316503072, Cambridge University Press

Paperback / softback, published 13 December 2018

533 pages
23 x 15 x 2.5 cm, 0.74 kg

'The book is a useful guide to a persistently difficult area of law and will be useful for practitioners, academics, and others interested both in the interaction between BITs and customary international law and the role of customary international law in international investment law.' Fabien Gelinas and Lucas Clover Alcolea, Transnational Dispute Management

Rules of customary international law provide basic legal protections to foreign investors doing business abroad. These rules remain of fundamental importance today despite the growing number of investment treaties containing substantive investment protection. In this book, Patrick Dumberry provides a comprehensive analysis of the phenomenon of custom in the field of international investment law. He analyses two fundamental questions: how customary rules are created in this field and how they can be identified. The book examines the types of manifestation of state practice which should be considered as relevant evidence for the formation of customary rules, and to what extent they are different from those existing under general international law. The book also analyses the concept of states' opinio juris in investment arbitration. Offering guidance to actors called upon to apply customary rules in concrete cases, this book will be of significant importance to those involved in investment arbitration.

Introduction
1. The concept of customary international law
2. Dancing with the sources: the fascinating story of the relative importance of custom and treaties at different times in the evolution of international investment law
3. State practice
4. Opinio juris
5. The fundamental importance of customary rules in international investment law
General conclusion.

Subject Areas: Arbitration, mediation & alternative dispute resolution [LNAC5]