Leslie tries to convince Jessica Newport to donate the Newport land to the national Park Service by reminding her that the Newport name has not always been associated with positive things. For instance when their hot fudge pipe exploded and the hot fudge flowed into the lake making the fish taste delicious. Negative externality or positive externality, you be the judge.
See more: externalities, negative externalities, positive externalities, private benefits, self-interest, social benefits, social costs
Economics of Parks & Recreation 