6. For a common resource such as fish, the marginal private benefit of an additional boat is the

____ and the marginal social benefit is the ____.

a.

catch per boat; quantity of fish that one boat can catch

b.

quantity of fish that one boat can catch; change in the total catch from an additional boat

c.

change in the total catch from an additional boat; catch per boat

d.

change in the total catch from an additional boat; change in the total catch from an

additional boat

e.

None of the above