A Few Observations on the Remaining Fundamental Importance of Customary Rules in the Age of Treatification of International Investment Law

Patrick Dumberry

(2016) 34(1) Association Suisse de l’Arbitrage (ASA) Bulletin 41-61.

Résumé (dans la langue de publication) :

This article examines the contemporary role of custom in the present context of the proliferation of BITs which have become in the last decades the most important source of international law in the area of foreign investment. The article will provide a survey of the changing importance of the different sources of international investment law overtime. I will argue that customary rules remain of fundamental importance even in this age of ‘treatification’. First, custom is the applicable legal regime of protection in the absence of any BIT. Second, custom is important in the many instances where BITs make explicit reference to the concept. Third, custom plays a gap-filling role whenever a treaty, a contract or domestic legislation is silent on a given issue. Finally, I will explain the reasons why arbitral tribunals should always take into account relevant rules of customary international law.

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À propos de l’auteur :

Patrick Dumberry est professeur agrégé à l'Université d'Ottawa, Section de droit civil, spécialisé dans le droit de l'investissement international. Il a pratiqué le droit international et l'arbitrage chez des cabinets d'avocats à Genève et à Montréal, ainsi qu’avec le ministère canadien des Affaires étrangères (Bureau du droit commercial).

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