A reduction in net exports will, all other things unchanged, shift the aggregate demand curve to the left.

The difference between a perfectly competitive firm's total revenue and its total cost is

A) always positive. B) always negative. C) always zero. D) greatest at the profit-maximizing level of output.

If there is pollution in producing a product, then the market equilibrium price

A) and equilibrium quantity are too low. B) and equilibrium quantity are too high. C) is too low and equilibrium quantity is too high. D) is too high and equilibrium quantity is too low.