In the United States, imports and exports make up more than half of GDP

Suppose a firm produces pollution when it generates electricity. The cost of the pollution is called the

A) marginal cost. B) marginal private cost. C) marginal external cost. D) marginal social cost.

Following adjustments to a new equilibrium in a market, the market clearing price remains unchanged, but the equilibrium quantity is now lower. Which of the following could definitely have caused this outcome?

A. Demand and supply both decreased. B. Demand increased, and supply decreased. C. Demand decreased, and supply increased. D. Demand and supply both increased.