---
title: "GATT Article I — Definition & Meaning | Model Diplomat"
description: "GATT Article I establishes the most-favoured-nation principle, ensuring equal trade advantages among WTO members. Essential for trade policy understanding."
url: "https://modeldiplomat.com/learn/glossary/gatt-article-i"
---

[New](https://modeldiplomat.com/)

#

Model Diplomat Research Team · Last reviewed June 22, 2026

TL;DR

- GATT Article I enshrines the most-favoured-nation principle, requiring every WTO member to extend any trade advantage granted to one member unconditionally to all other members.
- What is the difference between MFN treatment under Article I and national treatment under Article III?
- Why do free-trade agreements and the EU not violate GATT Article I?
- How does the Generalized System of Preferences (GSP) coexist with Article I?
- What does 'immediately and unconditionally' mean in Article I?

[Civil Service & Diplomatic Exams](https://modeldiplomat.com/learn/civil-services/glossary)Updated June 22, 2026

Go beyond the definition

## Research GATT Article I like a delegate

Model Diplomat's AI drafts position papers, speeches, and country research with real sources — built for MUN and politics students.

## Research it like a delegate

Research on modeldiplomat.com

## Ask a follow-up about GATT Article I

Open a cited briefing in Model Diplomat search — timelines, positions, and sources you can use in committee or exam answers.

[Start research on GATT Article I](https://modeldiplomat.com/search?q=Explain%20GATT%20Article%20I%20%E2%80%94%20key%20dates%2C%20actors%2C%20positions%2C%20and%20sources)

Example

In EC – Tariff Preferences (2004), the WTO Appellate Body ruled the European Communities' GSP drug-arrangements scheme breached GATT Article I by granting tariff preferences to selected developing countries on non-objective criteria.

Keep learning

## Go deeper than the definition

Lessons

[The Wto Regional Trade Agreements The Future Of Trade](https://modeldiplomat.com/learn/lessons/exam-global-economy-the-wto-regional-trade-agreements-the-future-of-trade)[Wto The Trade Regime](https://modeldiplomat.com/learn/lessons/exam-global-institutions-wto-the-trade-regime)[International Trade Law The Wto Dispute System](https://modeldiplomat.com/learn/lessons/exam-international-law-international-trade-law-the-wto-dispute-system)

Courses

[Exam Global Economy](https://modeldiplomat.com/learn/courses/exam-global-economy)[Exam Global Institutions](https://modeldiplomat.com/learn/courses/exam-global-institutions)[Exam International Law](https://modeldiplomat.com/learn/courses/exam-international-law)

[Explore all Civil Service & Diplomatic Exams lessons](https://modeldiplomat.com/learn/civil-services)[Test yourself with a quiz](https://modeldiplomat.com/learn/glossary/quiz/civil-services)

## Take GATT Article I beyond the glossary

Ask the AI research engine built for diplomacy — get briefings, position papers, and speeches with sources you can cite in committee.