5. Describe the following in terms of generating positive, negative, or zero externalities:

(a) a foot of snowfall in mid-January;

(b) living a mile away from an international airport;

(c) your neighbor painting a mural on the side of his house that faces yours;

(d) your neighbor’s watchdog, who is known to have an unpleasant disposition;

(e) a superstudent in a class in which grades are curved; and

(f) high-spirited motorcyclists.