Columbia subject headings:
Favored nation clause.
Non-tariff trade barriers.
Protectionism.
Tariff preferences.
Tariff.
World Trade Organization.
Harvard subject headings:
Favored nation clause.
Non-tariff trade barriers.
Protectionism.
Tariff preferences.
Princeton subject headings:
Favored nation clause.
Non-tariff trade barriers.
Protectionism.
Tariff preferences.