Microeconomics Monopoly and externalities

Which of the following is not a feature of a monopoly?
a) there are no barriers to entry or exit
b) location may restrict their market power
c) there are no close substitute goods
d) One firm is the only supplier of the good

In monopoly, the industry demand curve is the firms_________

Monopolists
a) maximize revenue, not profits
b) have no short run fixed costs
c) face downward sloping demand curves
d) are price takers

The marginal revenue curve for a monopoly_______

In a small town, marilyns Christmas tree lot has a monopoly on sales of trees. In order to increase her sales from 100 to 101 trees, she must drop the price of a tree from $20 to $19. What is the marginal revenue?

Which of the following is not an example of an activity with an external cost.
a) Noise pollution from a steel mill
b) keeping junk in front yard
c) Having to buy batteries for the new remote that came with the tv
d) A car burning oil
e) speeding on the interstate

The existence of externalities results in

If a copper mining operation discharges waste products into a river and causes higher costs and discomfort to downstream users of water for which they are not compensated, then_____