On the functional relationship between tariffs and welfare

This paper uses a model of trade in two commodities between two countries to establish the following proposition. If the foreign offer curve has no points of inflection and if for each home rate of duty the equilibrium most favorable to the home country is selected (or else there is only one equilibrium), then as the rate of duty increases from zero, home welfare first rises then declines while foreign welfare steadily falls. © 1975.