The principle that whenever a WTO member state lowers tariffs on certain kinds of imports from one member state, all member states are entitled to the same treatment with regard to their goods is known as the concept

Most-Favored-Nation principle

Explanation:

This means treating people equally under the WTO program. When you reduce tariff for a particular state, you'll have to do likewise for the other member states. It helps nation to receive the best trading term giving by their trading partner.

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