- Case 1: General exceptions - protect security and defense (Points a, b, e, f, g - Article XX GATT)
- Case 2: differential treatment and more favorable for developing countries Development (S & D).
- Case 3: The protective measures for trade (trade safeguards, anti-dumping, countervailing duties)
- Case 4: Exceptions to the agreement of free trade area (RTA) (GATT Article XXIV - Clause 5, 4, 8) + Article V of GATS
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