-Refer to the Above Figure $P _ { 1 }$
B)marginal Cost,which Is

Multiple Choice

-Refer to the above figure.Regulators cannot force natural monopolies to operate in the long run at a loss.Therefore,they usually require the firms to charge a price equal to

A) marginal cost,which is $P _ { 1 }$ .
B) marginal cost,which is $P _ { 2 }$ .
C) average cost,which is $\mathrm { P } _ { 3 }$ .
D) average cost,which is $\mathrm { P } _ { 4 }$ .