QUESTION 14 Which of the following is NOT an example of an externality? O The development of a vaccine for preventing flu. O Acid rain that destroys forest land throughout the Midwest. O Gas prices that doubled between 1998 and 1999. O A factory that dumps dangerous chemicals into the Ohio River. QUESTION 15 Which of the following is a characteristic of monopolies? O Producing less at a higher average cost O Producing more at a lower average cost O Eliminating price discrimination O Strengthening market forces