The Most favoured nation clause reference article from the English Wikipedia on 24-Jul-2004
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Most favoured nation clause

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A most favoured nation (MFN) clause is a clause in a trade agreement between two nations providing that each will extend to the other any trading privileges it extends to third nations. MFN clauses are generally subject to exceptions for free trade areas and customs unions.

One of the basic principles of the WTO is that each party extends to all other parties MFN status.

See also: National treatment.