International Law Theories: Natural Law vs. Positivism


Introduction

After arriving at the conclusion that International Law Theories are essential for understanding global legal systems, it is important to explore their foundational basis. Two main theories of International Law address this:

  1. Theories of Law of Nature
  2. Positivism

Theories of Law of Nature

Overview

Jurists who adhere to the theories of Law of Nature view International Law as a component of a higher legal framework. They argue that states comply with International Law because it is derived from natural law. Starke explains this viewpoint by stating that “States submitted to International Law because their relations were regulated by higher law, the law of nature, of which International Law was but a part.”

Historical Context

Initially, the Law of Nature was linked to religion and regarded as divine law. However, during the 16th and 17th centuries, jurists like Grotius secularized this concept. Grotius posited that natural law represents the dictates of right reason, and his followers viewed International Law as an application of natural law in specific contexts. Notable proponents of these International Law Theories include Vattel, Pufendorf, and Christian Thomasius.

Criticism

Despite its influence, the Law of Nature faces criticism:

  • Vagueness: Different jurists provide varying interpretations—justice, reason, utility—which renders the concept unclear within International Law Theories.
  • Lack of Practical Basis: Critics argue that it does not reflect the actual practices and realities of state interactions, which are essential in the study of International Law.

Influence on International Law

Nevertheless, the Law of Nature has significantly influenced the evolution of International Law Theories. Its idealistic principles continue to resonate, albeit in a less dogmatic form.

Positivism

Overview

Positivism, another key perspective within International Law Theories, contrasts with the Law of Nature by focusing on law as it is, rather than as it ought to be. According to positivists, laws enacted by legitimate authorities are binding. They emphasize actual state practices, asserting that treaties and customs are the primary sources of International Law.

Key Proponents

Bynkershoek and Starke are notable proponents of positivism within International Law Theories. Starke asserts that “International law can in logic be reduced to a system of rules depending for their validity only on the fact that States have consented to them.” Brierly echoes this, stating that international law consists of rules that states have agreed to follow.

The Will of States

The positivist view highlights the concept of state consent. Hegel introduced the idea that the will of states forms the core of International Law Theories. Anzilotti further emphasized the principle of pacta sunt servanda, which means agreements must be kept, as foundational to binding international obligations.

Criticism

The positivist theory faces several critiques:

  1. Metaphorical Will: The concept of state will is considered metaphorical rather than a concrete principle in International Law.
  2. Oversimplification of Consent: Not all aspects of International Law stem from explicit consent; customary laws can bind states without express agreement.
  3. Tacit Agreements: The idea that customary laws arise solely from tacit agreements is flawed, especially as new states automatically adhere to existing customs.
  4. Binding Principles: Certain principles apply to states regardless of consent, such as those outlined in the UN Charter.
  5. Evolving Norms: The norm pacta sunt servanda has been questioned, as not all obligations arise from agreements.
  6. Legal Effects of Declarations: Legal effects stem from rules of law, not merely from declarations of will.

Conclusion

While treaties and customs are acknowledged as the primary sources of International Law, the positivist view may overlook the complexities and realities of state behavior in international relations. Understanding these International Law Theories helps clarify the foundational principles guiding global legal interactions.


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“Exploring the Future of Ethics in International Arbitration”

The Asian International Arbitration Journal (AIAJ) has announced a call for papers for its November 2025 issue, inviting thought leaders and practitioners to delve into “Exploring the Future of Ethics in International Arbitration.” As a flagship journal published by Kluwer Law International and affiliated with the Singapore International Arbitration Centre (SIAC), the AIAJ offers contributors a robust platform to influence discourse in the arbitration field.

This edition’s theme is particularly timely, given the pivotal ethical developments in 2024. The adoption of the ICSID-UNCITRAL Code of Conduct for Arbitrators and the revised IBA Guidelines on Conflicts of Interest have sparked global discussions on independence, impartiality, and accountability in arbitration.

Potential submission topics include:

  • Ethical challenges in the age of social media;
  • The controversial practice of “double-hatting” by arbitrators;
  • Arbitrator immunity and liability considerations;
  • Standards for challenging and removing arbitrators.

Scholars are invited to submit abstracts of up to 500 words by February 1, 2025. Selected authors will proceed to submit their first drafts by April 1, with final submissions due by July 1.

The AIAJ follows a double-blind peer review process to ensure impartial evaluation. Articles must demonstrate in-depth analysis and relevance, with a word count of 8,000-10,000 (including footnotes).

By addressing critical issues shaping ethical standards in arbitration, contributors will not only engage with a global audience but also impact the evolution of international dispute resolution.

Don’t miss this opportunity to contribute to one of the leading journals in the field. For detailed submission guidelines and additional information, visit SIAC’s website.


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