At first glance, one may think of international investment law as a response to custom (or lack thereof), instead of a field of its application. However, in fact, the opposite is the case. The interpretation and application of customary rules and principles are the bread and butter of international investment law and arbitration. With a diverse range of expert contributors, this collection traces how customary international law is practised in international investment law. It considers how custom should be interpreted and how its rules and principles should be understood and applied by investor-state arbitral tribunals. Raising and addressing vital questions surrounding custom and international law, this collection is a necessary contribution to the scholarship of the theory and history of customary international law and international investment law. This title is also available as Open Access on Cambridge Core.

The strengths of international investment law - above all, a strong focus on investor interests and an effective adjudication and enforcement system - also entail its weaknesses: it runs the danger of impeding or even sanctioning the host states' legitimate regulatory interests and ignoring other fields of public international law. How does it cope with public interest concerns such as human rights, the environment or the fight against corruption? At the heart of this book lies a fresh approach towards a general theory of such global public interest considerations in the investment realm. Delineating how and why those considerations matter, and why the current system does not accommodate them properly, Andreas Kulick fleshes out general principles and customary international law as defences the host state may raise against alleged investor rights infringements and promotes proportionality as the appropriate balancing mechanism.

Driven by public opinion in host states, contracting parties to investment agreements are pursuing many avenues in order to curb a system that is being perceived - correctly or not - as having run out of control. Reassertion of Control over the Investment Treaty Regime is the first book of its kind to examine the many issues of procedure, substantive law, and policy which arise from this trend. From procedural aspects such as frivolous claims mechanisms, the establishment of appeals mechanism or state-state arbitration, to substantive issues such as joint interpretations, treaty termination or detailed definitions of standards of protection, the book identifies and discusses the main means by which states do or may reassert their control over the interpretation and application of investment treaties. Each chapter tackles one of these avenues and evaluates its potential to serve as an instrument in states' reassertion of control.

Driven by public opinion in host states, contracting parties to investment agreements are pursuing many avenues in order to curb a system that is being perceived - correctly or not - as having run out of control. Reassertion of Control over the Investment Treaty Regime is the first book of its kind to examine the many issues of procedure, substantive law, and policy which arise from this trend. From procedural aspects such as frivolous claims mechanisms, the establishment of appeals mechanism or state-state arbitration, to substantive issues such as joint interpretations, treaty termination or detailed definitions of standards of protection, the book identifies and discusses the main means by which states do or may reassert their control over the interpretation and application of investment treaties. Each chapter tackles one of these avenues and evaluates its potential to serve as an instrument in states' reassertion of control.

The strengths of international investment law - above all, a strong focus on investor interests and an effective adjudication and enforcement system - also entail its weaknesses: it runs the danger of impeding or even sanctioning the host states' legitimate regulatory interests and ignoring other fields of public international law. How does it cope with public interest concerns such as human rights, the environment or the fight against corruption? At the heart of this book lies a fresh approach towards a general theory of such global public interest considerations in the investment realm. Delineating how and why those considerations matter, and why the current system does not accommodate them properly, Andreas Kulick fleshes out general principles and customary international law as defences the host state may raise against alleged investor rights infringements and promotes proportionality as the appropriate balancing mechanism.