Monopolistically competitive firms could reduce the average total cost of producing by increasing output; therefore, these firms have

A tariff does not raise any revenue for the government if:

A) imports exceed exports. B) exports exceed imports. C) exports equal imports. D) it reduces imports to zero.

If there is unemployment in an economy, then the

A) economy is operating at an unattainable point. B) production possibilities frontier will shift inwards. C) production possibilities frontier must be bowed inward. D) economy is producing at a point inside the production possibilities frontier. E) production possibilities frontier will shift outwards.