© 2018

Customary Law Today

  • Laurent Mayali
  • Pierre Mousseron

Table of contents

  1. Front Matter
    Pages i-xiii
  2. Philosophical Foundations

    1. Front Matter
      Pages 1-1
    2. Maxime Grignon
      Pages 3-12
  3. General Customary Law

    1. Front Matter
      Pages 13-13
    2. Marie Bourdeau
      Pages 31-39
    3. Crystelle Sanchez-Saëz
      Pages 41-52
    4. Philippe Grignon
      Pages 53-71
  4. National Customary Law

  5. International Customary Law

About this book


This book addresses current practices in customary law. It includes contributions by scholars from various legal systems (the USA, France, Israel, Canada etc.), who examine the current impacts of customary law on various aspects of private law, constitutional law, business law, international law and criminal law. 
In addition, the book expands the traditional concept of the rule of law, and argues that lawyers should not narrowly focus on statutory law, but should instead pay more attention to the impact of practices on “real legal life.” It states that the observation of practices calls for a stronger focus on usage, customs and traditions in our legal systems – the idea being not to replace statutory law, but to complement it with customary observations.


Customary law Opinio iuris Model contracts International trade usage Arbitration Usage in state practice

Editors and affiliations

  • Laurent Mayali
    • 1
  • Pierre Mousseron
    • 2
  1. 1.Berkeley LawUniversity of CaliforniaBerkeley, CAUSA
  2. 2.Faculty of LawUniversity of MontpellierMontpellierFrance

About the editors

Laurent Mayali, Lloyd M. Robbins Professor of Law, Berkeley Law
Pierre Mousseron, Professeur, Faculté de Droit de Montpellier, Président de l’Institut des Usages

Bibliographic information