At what quantity would a purely competitive firm cover all of its costs and earn only normal profits?

IPods and headphones are examples of which of the following?

a. Substitutes b. Inferior Goods c. Complements d. None of the above

In a two-country, two-commodity model, if a country has higher labor productivity in producing both the goods, it must produce and export both the goods to the other country.

Answer the following statement true (T) or false (F)