The WTO and Regional Trade: a family business? The WTO compatibility of regional trade agreements with non-WTO-members

Numerous WTO members pursue regional economic integration with both other members and non-WTO-members. The resulting derogation from the most-favoured-nation principle needs to be justified in accordance with the relevant WTO provisions. Regional integration in the service sector is expressly allowed between WTO and non-WTO members pursuant to GATS Article V. In the absence of clear regulation, it has been questioned whether the same is true for regional trade agreements (RTAs) covering trade in goods. Providing a comprehensive interpretation, this paper argues that neither GATT Article XXIV nor the Enabling Clause require the WTO membership of all the parties to an RTA.