Protectionist measures may permit domestic industries to thrive, which under free trade would wither in the face of cheap imports. Imports may be opposed by the government in the public interest--for example because it thinks it imprudent to rely upon foreign suppliers of certain strategic goods such as staple foods, energy, or military equipment, or because it wishes to nurture an infant industry as yet too weak to compete internationally, or because it wishes to preserve traditional industries such as fishing in order to preserve employment and local communities.
Vaughan Lowe
international-law, law, politics