When a country or a region of a country specializes in producing the product that has the lower opportunity cost compared to another country or region, it is practicing

Suppose the Chinese government regulates the price of food and forbids firms from setting a higher price. In this case the government is setting a

A) price floor. B) price ceiling. C) quota. D) tax.

Using the above figure, which of the lines in the above diagram represents a proportional tax?

A) A B) B C) C D) none of them