According to the normal-trade-relations (most-favored-nation (MFN)) principle, if the United States extends MFN treatment to China and then grants a low tariff on imports of shirts from South Korea, the United States is obligated to provide the identical low tariff on imports of shirts from China.

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According to the normal-trade-relations (most-favored-nation (MFN)) principle, MFN treatment must be extended to all member countries and any tariff concessions granted to one member country must be extended to all other member countries on equal terms. Therefore, if the United States grants a low tariff on imports of shirts from South Korea, it must also extend the same low tariff to imports of shirts from China if both countries are members of the World Trade Organization and receive MFN treatment.

According to the Normal-Trade-Relations (Most-Favored-Nation (MFN)) Principle, If the United