Most Favored Nation (MFN), Bound Tariff (BND) and Effectively Applied (AHS). One, the new Tariff Analysis Online, draws on two databases to offer tariff rates on. A tariff applied to a country with most favored nation status. In international economic relations and international politics, most favoured nation (MFN) is a. The most-favored-nation clause requires countries to offer the same trade terms.