07/10/2025
Introduction: The Non-Discrimination Principle in Investment Protection
The National Treatment (NT) and Most-Favoured-Nation (MFN) clauses are central pillars of Portugal’s bilateral investment treaty (BIT) practice, designed to ensure that foreign investors are not placed at a disadvantage compared with domestic or third-country investors. Although both standards pursue the objective of non-discrimination, their formulation and interpretation in Portuguese treaties reveal a deliberate evolution, balancing openness to foreign capital with the preservation of regulatory autonomy.
Early Treaty Practice: Separate Standards and Capital-Importing Context
In Portugal’s early generation of BITs, concluded throughout the 1990s, NT and MFN obligations were generally articulated in separate provisions.