Introduction

Most-Favoured Nation (MFN) clauses and their possible extension to dispute settlement mechanisms are at the heart of a significant debate in international investments law. This debate is very lively but it is currently unsettled, as demonstrated by persisting disagreements between opposite Schools of thoughts and multiple inconsistencies in arbitral decisions. MFN clauses were reconsidered recently following a claim brought by ICS Inspection and Control Services Limited against Argentina before the Permanent Court of Arbitration (PCA). The PCA arbitrators rendered a decision ...