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Under what conditions does the World Trade Organization allow free-trade areas and customs unions?
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World Trade Organization
Workers sewing clothing in a garment factory in Ho Chi Minh City in April, 2025.
The World Trade Organization (WTO) permits the formation of customs unions and free-trade areas, provided they adhere to specific conditions originally established under GATT Article XXIV. These conditions are designed to ensure that regional trade agreements promote efficiency and protect the rights of non-member countries.1
To be compliant, these agreements must meet the following criteria:
- Comprehensive Coverage: Duties and other trade restrictions must be eliminated on "substantially all the trade" among the participating countries. This requirement prevents partial preferential arrangements that tend to cause trade diversion rather than trade creation.1
- Reasonable Timeframe: The elimination of internal trade barriers must occur within a "reasonable length of time," which is generally interpreted as being within 10 years.1
- External Protection: Barriers to imports from non-member countries must not, on the whole, be higher or more restrictive than those that existed prior to the establishment of the customs union or free-trade area.1
These rules aim to balance the benefits of regional integration with the necessity of maintaining an open, non-discriminatory global trading system.1