A cap$-$and$-$trade policy is an efficient method of reducing pollution because

Question $3$Select one:

a$.$

those who can reduce pollution relatively more cheaply will have an incentive to sell permits.

b$.$

only high$-$cost firms will be forced to reduce pollution.

c$.$

those who can reduce pollution relatively more cheaply will have an incentive to buy permits.

d$.$

all firms will be forced to reduce pollution.