Marginal land is on the borderline of being used in production

As a result of trade, specialization in the Ricardian model tends to be

A) complete with constant costs and with increasing costs. B) complete with constant costs and incomplete with increasing costs. C) incomplete with constant costs and complete with increasing costs. D) incomplete with constant costs and incomplete with increasing costs. E) dependent on the specific opportunity costs involved in production.

Some nations are more involved in international trade than others, as measured by exports as a percentage of GDP. Which of the following most closely matches the exports as a percentage of GDP for the U.S. in 2009?

a. 71 percent b. 51 percent c. 31 percent d. 11 percent