21.
When an externality is present, the market equilibrium is
a.
efficient, and the equilibrium maximizes the total benefit to society as a whole.
b.
efficient, but the equilibrium does not maximize the total benefit to society as a whole.
c.
inefficient, but the equilibrium maximizes the total benefit to society as a whole.
d.
inefficient, and the equilibrium does not maximize the total benefit to society as a whole.
22.
When externalities exist, buyers and sellers
a.
neglect the external effects of their actions, but the market equilibrium is still efficient.
b.
do not neglect the external effects of their actions, and the market equilibrium is efficient.
c.
neglect the external effects of their actions, and the market equilibrium is not efficient.
d.
do not neglect the external effects of their actions, and the market equilibrium is not efficient.