Students at a nearby college often complain about assignments requiring group work. The statement "I could have done a better job by myself" is often heard.

(a) Explain why group work, in which everyone in the group receives the same grade, is a

public good.

(b) Explain at least two ways in which the incentive to free-ride manifests itself in group

work.

(c) Is the quality complaint heard by students consistent with what theory might suggest?