## Microsoft word - practice questions q&a 15.doc

Chapter 15

1. a. What are the three sources of the barriers to entry that allow a
monopoly to remain the sole seller of a product? Answer: A key resource is owned by a single firm (monopoly resource), the government gives a single firm the exclusive right to produce a good (government created monopoly), the costs of production make a single producer more efficient (natural monopoly). b. What is the entry barrier that is the source of the monopoly power for the following products or producers? List some competitors that keep these products or producers from having absolute monopoly power. 1. The UK’s Royal Mail (postal service) 5. Economics, by N. Gregory Mankiw and Mark P. Taylor (your textbook) Answer: 1. Natural monopoly. E-mail, Fax machines, telephone, private delivery such as Federal Express. 2. Monopoly resource. Other bottled water, soft drinks. 3. Government created monopoly due to a patent. Other drugs for depression, generic drugs when the patent expires. 4. Monopoly resource. Other gems such as emeralds, rubies, sapphires. 5. Government created monopoly due to copyright. Other principles of economics text books. 2. Suppose a firm has a patent on a special process to make a unique smoked salmon. The following table provides information about the demand facing this firm for this unique product. Practice Questions to accompany Mankiw & Taylor: Economics Plot the demand curve and the marginal revenue curve in Exhibit 1. Practice Questions to accompany Mankiw & Taylor: Economics Exhibit 5

Suppose that there are no fixed costs and that the marginal cost of production of smoked salmon is constant at €6 per kilogram. (Thus, the average total cost is also constant at €6 per kilogram.) What is the quantity and price chosen by the monopolist? What is the profit earned by the monopolist? Show your solution on the graph you created in part
Q = between 3 and 4 units (say 3.5), P = between €12 and €14, (say €13). Profit = TRTC
or profit = (3.5 x €13) – (3.5 x €6) = €45.50 – €21.00 = €24.50. (Or profit = (PATC) x Q =
(€13 – €6) x 3.5 = €24.50.) See Exhibit 6.

Exhibit 6

See Exhibit 7.

Exhibit 7

Suppose government regulators force this firm to set the price equal to its marginal cost in order to improve efficiency in this market. In Exhibit 3 show the profit or loss generated by this firm. Practice Questions to accompany Mankiw & Taylor: Economics Exhibit 8

In the long run, will forcing this firm to charge a price equal to its marginal cost improve efficiency? Explain. Answer: No. Since marginal cost must be below average total cost if average total cost is declining, this firm will generate losses if forced to charge a price equal to marginal cost. It will simply exit the market, which eliminates all surplus associated with this market. Practice Questions to accompany Mankiw & Taylor: Economics

Source: http://cws.cengage.co.uk/mankiw_taylor/students/pract_qs/quanda15.pdf

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