1. Sample Questions for Exam 3
Chapters 12,13,14,15

2. Define Different Market Structures
11 – 1
The Four Market Structures
MARKET STRUCTURE
CHARACTERISTIC
PERFECT COMPETITION
MONOPOLISTIC COMPETITION
OLIGOPOLY
MONOPOLY
Number of firms
Type of product
Ease of entry
Examples of industries
Many
Identical
Easy
Wheat
Apples
Differentiated
Selling DVDs
Restaurants
Few
Identical or differentiated
Difficult
Manufacturing computers
Manufacturing automobiles
One
Unique
Entry blocked
First-class mail delivery
Tap water

3. Perfectly Competitive Markets
(1) many buyers and sellers,
(2) firms selling identical products,
(3) no barriers to new firms entering the market.
Why are these firms price-takers?
(1) many buyers and sellers
(2) firms sell identical products

4. Perfectly Competitive Market
On the graphs, find the output quantity that maximizes profit for a perfectly competitive firm.
Find the amount of profit at the optimum quantity on the TR and TC graph.

5. Illustrating Profit or Loss on the Cost Curve Graph
Find the profit maximizing quantity for a perfectly competitive firm on the graph.
What defines the profit maximizing quantity?
(P = MR = MC)
If P > ATC, then profit is which one of the following?
= 0, zero
> 0, positive
< 0, negative
can’t tell

6. Illustrating Profit or Loss on the Cost Curve Graph
Illustrating When a Firm Is Breaking Even or Operating at a Loss
P > ATC, which means the firm makes a profit
P = ATC, which means the firm breaks even (its total cost equals it total revenue)
P < ATC, which means the firm experiences losses

7. Deciding Whether to Produce or to Shut Down in the Short Run
What quantity should a perfectly competitive firm produce if ATC > P > AVC?
Why stay in business if ATC > P > AVC?(cover some fixed cost)
What is the minimum price a perfectly competitive firm needs to produce output?
(find on graph)
Perfectly competitive firm with P < AVC produces:
(nothing, shutdown)

8. Economic Profit Leads to Entry of New Firms
How does a perfectly competitive market with π > 0 transition to Long Run Equilibrium? (entry shifts supply) What is profit in Long Run Equilibrium? (π = 0)

9. Perfect Competition and Efficiency
Define Productive efficiency: a good is produced at the lowest possible cost.
Perfect Competition achieves Allocative Efficiency because: marginal benefit (price) is equal to marginal cost on the last unit produced.

10. Define Monopoly?
Monopoly The only seller of a good or service that does not have a close substitute.
The most common barriers to entry are
economies of scale, ownership of a key input, and government imposed barriers
A monopolist faces which of the following:
a) horizontal demand
b) downward sloping demand
c) perfectly elastic demand
d) perfectly inelastic demand

11. Where Do Monopolies Come From?
Maintaining a monopoly requires
a) perfectly inelastic demand
b) an insurmountable barrier to entry
c) few competitors
d) MD = D
Governments grant patents to encourage
a) low prices on existing products
b) competition for natural monopolies
c) research and development on new products
d) firms to form corporations
Compared to perfect competition, consumer surplus in monopoly is
a) higher
b) lower
c) eliminated
d) unchanged

12. Monopoly Profit Maximization
Learning Objective 14.3
Monopoly Profit Maximization
Identify the profit maximizing price and quantity for a monopolist on a graph. (MR = MC)

13. Does Monopoly Reduce Economic Efficiency?
Measuring the Efficiency Losses from Monopoly
Find the area representing the deadweight loss due to monopoly on a graph.

14. MARKET POWER, PROFITS, AND EFFCIENCY
Economic Efficiency occurs when
a) consumer surplus is maximized
b) producer surplus is minimized
c) the price is low
d) the sum of producer and consumer surplus is maximized
Long run economic profits are most likely in
a) monopoly only
b) monopoly and monopolistic competition
c) monopoly and oligopoly
d) none of the above
Market power is defined as the ability to set price
a) above ATC
b) above AVC
c) above MC
d) above MR

15. Policy Toward Monopoly
The first U.S. antitrust law was the
a) Clayton Act
b) Sherman Act
c) FTC Act
d) Cellar-Kefauver Act
In the U.S., natural monopolies are most often regulated by
a) Department of Justice
b) Federal Trade Commission
c) state or local regulatory commissions
d) Federal Communications Commission
The U.S. antitrust laws are enforced by the
c) Department of Commerce
d) both a and b

16. Antitrust The purpose of the antitrust laws is
To make illegal attempts to monopolize or collude
Calculate HHI from market shares: 60%, 20%, 9%, 1%
= = 4082
If the firms with 9% and 1% merge, what is the HHI
= 4100
Will the Government challenge this merger?

17. Government Policy toward Monopoly
The Department of Justice and the Federal Trade Commission Merger Guidelines
MERGER STANDARDS
Post-Merger HHI Below 1,000. These markets are not concentrated, so mergers in them are not challenged.
Post-Merger HHI Between 1,000 and 1,800. These markets are moderately concentrated. Mergers that raise the HHI by less than 100 will probably not be challenged. Mergers that raise the HHI by more than 100 may be challenged.
Post-Merger HHI Above 1,800. These markets are highly concentrated. Mergers that increase the HHI by less than 50 points will not be challenged. Mergers that increase the HHI by 50 to 100 points may be challenged. Mergers that increase the HHI by more than 100 points will be challenged.

18. Define Monopolistic Competition
barriers to entry are low
many firms compete
similar, but not identical, (differentiated) products.
Many sellers facing downward sloping demand curves.
Positive profits in monopolistic competition will attract entry in the long run.

19. Monopolistic Competition
Find the profit maximizing price and quantity on a graph (MR=MC).
Identify long run equilibrium (zero profit) on a graph.

20. Comparing Perfect Competition and Monopolistic Competition
12 - 6
Comparing Long-Run Equilibrium under Perfect Competition and Monopolistic Competition
Is monopolistic competition
a) productively efficient?
no – not at min ATC
b) allocatively efficient?
no – P > MC

21. Consumers benefit from monopolistic competition because
a) price is lower than in perfect competition
b) price is the same as in perfect competition
c) high quality products are available at low prices
d) consumers can choose products closer to their tastes

22. Which of the following are true in oligopoly
Oligopoly A market structure in which a small number of interdependent firms compete.
Which of the following are true in oligopoly
firms pay no attention to rivals
advertising has no effect on rivals
one firm’s pricing decision affects all other firms
pricing decisions have no effect on other firms

23. Using Game Theory to Analyze Oligopoly
Find Nash Equilibrium given the payoff table below
Do these firms have dominant strategies?
If the firms collude, can they increase their payoffs?
Nash equilibrium A situation where each firm chooses the best strategy, given the strategies chosen by other firms.

24. Definitions
Cooperative equilibrium An equilibrium in a game in which players cooperate to increase their mutual payoff.
Noncooperative equilibrium An equilibrium in a game in which players do not cooperate but pursue their own self-interest.
Dominant strategy A strategy that is the best for a firm, no matter what strategies other firms use.
Collusion An agreement among firms to charge the same price or otherwise not to compete.
Prisoners’ dilemma A game in which pursuing dominant strategies results in noncooperation that leaves everyone worse off.

25. Sequential Games
Find Nash Equilibrium

26. Which of the following is most likely to have bargaining power as a buyer?
a) an online store purchases books from publishers
b) a small ice cream producer seeks milk supplies from dairy farms
c) a pork barbecue producer buying pigs from farmers
d) the world’s largest discount store buys products made exclusively for its stores