I model the ocean as an array of lines set within a two-dimensional frame, and show how the Exclusive Economic Zone emerged as an equilibrium in customary international law. I find that custom codifies the efficient Nash equilibrium of enclosure for nearshore fisheries. For highly migratory and...

I model the ocean as an array of lines set within a two-dimensional frame, and show how the Exclusive Economic Zone emerged as an equilibrium in customary international law. I find that custom codifies the efficient Nash equilibrium of enclosure for nearshore fisheries. For highly migratory and...

Although the Igbo customary law of succession, which espouses the primogeniture principle, has recently been lambasted by the Nigerian courts for violating the equality provisions of the Nigerian Constitution and discriminating against women, the judicial engagement with the Igbo inheritance law...

This article will assess whether the changes in asylum-seeker movement over the most recent ten years to more significantly involve new states, such as the conflicts in Syria and Ukraine, may be bringing about changes in how we assess customary international law on refugee law. The recent...

In the most recent few years, customary international law is increasingly crystalizing to affirm that states must grant nationality to children born in their territory, if they would be otherwise stateless. In prior scholarship, this author has argued that such a norm of a customary...

After the Supreme Court of Canada’s decision in Nevsun Resources Ltd. v. Araya, Canadian courts can, in theory, apply customary international law (CIL) to private corporate actors for the purposes of a transnational tort claim pursuant to allegations related to human rights and/or...

Despite the large number of environmental agreements at the global, regional and bilateral levels, the role of customary international law remains of great importance in practice. First, many treaties which are in force remain largely unimplemented. Secondly, treaties only bind those States that...

It is often observed in the literature on customary international law that the identification practice of the International Court of Justice for customary norms deviates from the traditional definition of customary law in Art. 38 (1) lit. b of the ICJ Statute. However, while there are many...

This article examines whether or not the FET standard has become a rule of customary international law. The article contains the first empirical analysis of this question based on the two conditions under which a treaty-based norm can transform into a customary rule. The article will argue that...

Before 1804, France was strictly divided in terms of legal regimes: a part was under Roman civil law while the majority of the territory was under customary laws which, as with common law, gave more flexibility to judges and fewer rights to the state. This dichotomy offers the unique opportunity...

In recent years, the banking industry has witnessed several cases of excessive risk-taking that frequently have been attributed to problematic professional norms. We conduct experiments with employees from several banks in which we manipulate the saliency of their professional identity and...

In recent years, the banking industry has witnessed several cases of excessive risk-taking that frequently have been attributed to problematic professional norms. We conduct experiments with employees from several banks in which we manipulate the saliency of their professional identity and...

The laws dealing with intestate and testamentary succession in India are not uniform. A variety of laws are in vogue whose application depends on multiple factors. While the Hindus, Muslims, Christians, Parsis and the Jews have distinct personal laws of their own, the Scheduled Tribes in India...

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...

Indigenous customary laws often conflict with or contradict contract laws of foreign legal systems. If an indigenous person wishes to conduct an international transaction according to their customs, problems may arise where customs are inconsistent with governing laws. This paper examines the...

It is often observed in the literature on customary international law that the identification practice of the International Court of Justice for customary norms deviates from the traditional definition of customary law in Art. 38 (1) lit. b of the ICJ Statute. However, while there are many...

Customary law has been criticized from very different angles. Rational choice theorists claim that what looks like custom is nothing but self-interest. Positivists doubt that anything beyond consent assumes the force of law. In this paper, we adopt an experimental approach to test these claims....

While treaty norms only bind states that have explicitly consented to a treaty, the case is less clear with customary international law. According to the prevailing opinion in international law scholarship, states are not bound by a customary norm if they have persistently objected to the...

The paper examines the potential of customary international law to protect global public goods. In particular, it focuses on the question whether customary law can contribute to the mitigation of climate change. The analysis proceeds in the three steps. First, it will have a closer look at the...

Lesotho has a dual legal system, one based on customary law and the other on the received law. This appears clearly from the Constitution that ring-fenced customary law from any constitutional scrutiny. A customary practice may continue even if it discriminates against women and children. As a...

The paper examines the potential of customary international law to protect global public goods. In particular, it focuses on the question whether customary law can contribute to the mitigation of climate change. The analysis proceeds in the three steps. First, it will have a closer look at the...

The legal framework surrounding globalization is far from clear. Globalization is inextricably linked to the idea of free movement of capital vis-à-vis states’ restrictions. The leading approach in international law argues that states have the ultimate right to regulate their money. Invoking...

This article articulates an explanatory theory of customary international law under which precedential concerns are central to explaining CIL formation, compliance and change. In contrast with previous theories, which emphasize the role of reciprocity, retaliation and reputation in sustaining...

For centuries a hybrid of British and Roman-Dutch law peacefully co-existed with African Customary Law. However, there has been growing concern for women’s rights as opposed to cultural autonomy. This has resulted in the South African Constitutional Court finding that African Customary...

The question of the existence of legal protection for foreign investors under customary international law (or “custom”) has always been controversial. As a result of this perceived lack of established customary principles, States concluded thousands of bilateral investment treaties in the...

This paper examines the formation and evolution of customary international law in the field of foreign investment (Parts II and III) and its various forms interaction with international treaties, focussing mainly on BITs (Parts IV to IX). Although a comprehensive study on the customary rules for...

This contribution to a symposium on Kiobel v. Royal Dutch Petroleum Co. examines two ways of looking at the question of corporate liability under customary international law. It argues that the Second Circuit was wrong to ask whether a “norm of corporate liability” exists in the abstract and...

Customary international law is one of the three main sources of international law; lamentably, it has historically received little attention from law and economics scholars, despite providing rich material for economic analysis. In this chapter, we provide a concise overview of recent research...

This contribution analyzes the role of consent in the formation of customary law. It will challenge the assumption that customary norms cannot bind states against their will. Relying on game theory, it will distinguish between different situations and argue that the role of consent differs...

Customary law has been criticized from very different angles. Rational choice theorists claim that what looks like custom is nothing but self-interest. Positivists doubt that anything beyond consent assumes the force of law. In this paper, we adopt an experimental approach to test these claims....

Customary law has been criticized from very different angles. Rational choice theorists claim that what looks like custom is nothing but self-interest. Positivists doubt that anything beyond consent assumes the force of law. In this paper, we adopt an experimental approach to test these claims....

This chapter zeroes in on customary international law and examines the role played by this specific source of law in the development of international investment law. After a few considerations on the early phase of development of an international investment protection regime and the search for a...

Theory about the relevance of soft law abounds; empirical research on the topic does not. This study begins to even out this imbalance by not only developing a number of conjectures based on institutional economics, but also by testing them empirically. Based on all 2,289 soft laws concluded by...

This article looks at the emergence and evolution of the customary international humanitarian law applicable in situations of non-international armed conflict. In the years since the adoption of the Geneva Conventions and the Additional Protocols, a large number of rules relating to conduct in...