中等ECON-INTA-014
Which statement is accurate?
A. A tariff rewrites opportunity-cost ratios, so comparative advantage disappears
B. A tariff changes domestic prices and quantities; it does not itself create comparative advantage✓ 答案
C. A tariff and a free good are the same policy
D. A tariff is a shift of the demand curve for every non-traded service
解說
Comparative advantage is about opportunity cost. A tariff drives a wedge between the world price and the domestic price. It does not make the protected good a free good, and it is not a demand shift for unrelated services.