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Question 1. Which of the following is NOT a characteristic of a pure monopoly? A) Single seller B) Identical products sold by many firms C) High barriers to entry D) Price maker Answer: B Explanation: A pure monopoly has only one seller; identical products sold by many firms describe perfect competition, not monopoly. Question 2. In the market structure continuum, which structure typically has the lowest price and highest output? A) Monopoly B) Oligopoly C) Monopolistic competition D) Perfect competition Answer: D Explanation: Perfect competition yields the lowest price and highest output because firms are price takers and produce where P = MC. Question 3. A patent that gives a firm exclusive rights to produce a drug for 20 years is an example of a: A) Natural barrier B) Legal barrier C) Technological barrier D) Strategic barrier Answer: B
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Explanation: Patents are legal barriers that prevent entry by granting exclusive rights. Question 4. Which of the following best explains why a monopolist’s demand curve is downward sloping? A) The firm can sell any quantity at the market price. B) The firm must lower price to sell additional units. C) The firm faces a perfectly elastic demand. D) The firm’s cost curve determines demand. Answer: B Explanation: As the only seller, the monopolist can only increase sales by reducing price, giving a downward-sloping demand curve. Question 5. If a monopolist’s marginal revenue is equal to marginal cost at Q = 50, what does this point represent? A) Minimum efficient scale B) Profit-maximizing output C) Break-even point D) Shutdown point Answer: B Explanation: The MR = MC rule identifies the output that maximizes profit for a monopoly. Question 6. Total revenue (TR) is calculated as: A) Price × Quantity B) Marginal cost × Quantity C) Fixed cost + Variable cost D) Average revenue × Quantity
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Answer: A Explanation: By charging each consumer their maximum willingness to pay, the monopolist captures all consumer surplus. Question 10. Which of the following is essential for a firm to successfully practice third-degree price discrimination? A) Ability to charge each consumer a different price based on individual willingness to pay. B) Uniform product quality across all markets. C) Ability to segment markets and prevent resale among them. D) Constant marginal cost across all segments. Answer: C Explanation: Market segmentation and preventing arbitrage are necessary for third-degree discrimination. Question 11. In second-degree price discrimination, a firm typically: A) Offers a single price to all customers. B) Charges different prices based on observable consumer characteristics. C) Provides quantity-based discounts or block pricing. D) Charges each consumer his exact willingness to pay. Answer: C Explanation: Second-degree discrimination uses pricing schedules that vary with the quantity purchased. Question 12. Deadweight loss (DWL) from monopoly arises because: A) Price equals marginal cost. B) Output is higher than the socially optimal level.
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C) The monopolist produces less than the allocatively efficient quantity. D) Fixed costs are higher than variable costs. Answer: C Explanation: Monopoly restricts output below the level where P = MC, creating a loss of total surplus. Question 13. A monopoly is productively efficient when it produces at: A) Minimum average total cost (ATC) B) Minimum average variable cost (AVC) C) Point where P = MC D) Maximum marginal revenue Answer: A Explanation: Productive efficiency occurs at the lowest point on the ATC curve. Question 14. X-inefficiency refers to: A) Firms minimizing costs due to competitive pressure. B) Higher costs because the firm lacks incentive to reduce waste. C) Excessive investment in research and development. D) Overproduction relative to market demand. Answer: B Explanation: X-inefficiency describes cost inefficiencies arising from a lack of competitive discipline. Question 15. Rent-seeking behavior is best illustrated by: A) A firm investing in new technology to lower production costs. B) A monopoly lobbying for stronger patent protection.
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A) Earns zero economic profit. B) Earns a normal profit but may still have some deadweight loss. C) Produces at minimum ATC. D) Is forced to shut down if P < AVC. Answer: B Explanation: Setting P = ATC allows the firm to cover all costs, earning a normal profit, though output may still be inefficient. Question 19. A horizontal merger involves: A) Two firms at different stages of production. B) Two firms that produce unrelated products. C) Two firms that are direct competitors in the same market. D) A firm acquiring a supplier. Answer: C Explanation: Horizontal mergers combine firms that operate at the same level in the same industry. Question 20. The Herfindahl-Hirschman Index (HHI) is calculated by: A) Summing the squares of each firm’s market share percentages. B) Multiplying the number of firms by the average market share. C) Adding the market shares of the top three firms. D) Dividing total industry output by the number of firms. Answer: A Explanation: HHI = Σ (market shareᵢ)², using percentages. Question 21. In a market with strong network effects, the value of a product to an individual consumer:
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A) Decreases as more people use it. B) Remains constant regardless of the number of users. C) Increases as more people adopt the product. D) Is unrelated to the number of users. Answer: C Explanation: Network effects mean each additional user raises the product’s utility for others. Question 22. Platform monopolies are characterized by: A) Single-sided markets with homogeneous goods. B) Multi-sided markets that connect distinct user groups. C) No need for regulation because they are inherently efficient. D) Absence of any externalities. Answer: B Explanation: Platforms facilitate interactions between two or more distinct groups (e.g., buyers and sellers). Question 23. Which of the following best describes a natural monopoly? A) A firm with high fixed costs and low marginal costs, making a single firm most efficient. B) A firm that controls a scarce resource through ownership. C) A firm granted a government license to operate. D) A firm that uses aggressive advertising to dominate the market. Answer: A Explanation: Natural monopolies arise when economies of scale are so large that one firm can supply the entire market at lower cost.
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Explanation: Profit is maximized where MR = MC; thus MC must equal the constant MR of $8. Question 27. Which of the following would most likely reduce the deadweight loss associated with a monopoly? A) Raising the price above marginal cost. B) Implementing a price ceiling at the monopoly’s average total cost. C) Allowing the monopoly to increase output until P = MC. D) Increasing the monopoly’s fixed costs. Answer: C Explanation: Moving output to the point where P = MC eliminates the allocative inefficiency. Question 28. In the context of antitrust, a “clog-down” refers to: A) A merger that substantially lessens competition. B) The removal of a barrier to entry. C) The introduction of a price floor. D) The enforcement of a patent. Answer: A Explanation: “Clog-down” is a colloquial term for a merger that reduces competition, potentially violating antitrust laws. Question 29. The Clayton Act specifically addresses: A) Collusive price fixing only. B) Acquisitions that may substantially lessen competition. C) The creation of natural monopolies. D) Regulation of utility rates.
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Answer: B Explanation: The Clayton Act prohibits mergers and acquisitions that may substantially lessen competition. Question 30. Which of the following is an example of a “price-cap” regulation? A) Setting price equal to marginal cost. B) Allowing the firm to set any price below a maximum limit. C) Requiring the firm to charge average total cost. D) Mandating a minimum price. Answer: B Explanation: A price cap establishes an upper bound on the price a regulated monopoly may charge. Question 31. A monopoly that faces a perfectly inelastic demand curve would have: A) Zero marginal revenue for any output. B) MR equal to price at all quantities. C) No deadweight loss regardless of output. D) Unlimited ability to raise price without losing sales. Answer: D Explanation: Perfectly inelastic demand means quantity demanded does not change with price, allowing the firm to raise price arbitrarily. Question 32. Which of the following best illustrates “price elasticity of demand” in a monopoly context? A) The slope of the marginal cost curve. B) The percentage change in quantity demanded divided by the percentage change in price. C) The ratio of total revenue to total cost.
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C) MR < P because the firm must lower price to sell additional units. D) MR = MC always. Answer: C Explanation: Because the monopolist must lower price on all units to sell one more, MR lies below price. Question 36. Which of the following would most likely increase a monopoly’s market power? A) Entry of many small competitors. B) Loss of a patent protecting its product. C) Acquisition of a key raw-material supplier. D) Implementation of price regulation at marginal cost. Answer: C Explanation: Controlling an essential input raises barriers to entry and strengthens market power. Question 37. The “Lerner Index” measures monopoly power as: A) (P – MC)/P B) (P – ATC)/ATC C) (MR – MC)/MR D) (TR – TC)/TR Answer: A Explanation: The Lerner Index = (P – MC)/P, indicating the markup over marginal cost. Question 38. Which of the following is a typical feature of a “regulatory capture” scenario?
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A) Regulators act in the public interest. B) Firms influence regulators to enact rules favorable to themselves. C) Competition is increased through deregulation. D) Prices are set below marginal cost. Answer: B Explanation: Regulatory capture occurs when agencies advance the interests of the industry they regulate. Question 39. When a monopoly faces a downward-sloping average total cost curve, the firm’s marginal cost is: A) Always above ATC. B) Equal to ATC at the minimum point. C) Constant regardless of output. D) Irrelevant for pricing decisions. Answer: B Explanation: MC intersects ATC at ATC’s minimum; before that MC < ATC, after that MC > ATC. Question 40. In the context of digital platforms, “cross-side network effects” refer to: A) The impact of more users on one side increasing value for the other side. B) The effect of advertising on user satisfaction. C) The reduction of marginal cost as users increase. D) The ability to charge different prices to the same user group. Answer: A Explanation: Cross-side effects occur when increased participation on one side (e.g., sellers) raises the utility for the other side (e.g., buyers).
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Answer: B Explanation: The profit-maximizing output occurs where MR = MC, which is at the intersection point—here at 10 units. Question 44. Which of the following statements about “natural monopoly regulation” is true? A) Price caps always lead to a shortage. B) Marginal-cost pricing may require a subsidy to the firm. C) Average-cost pricing eliminates all deadweight loss. D) Regulation is unnecessary because natural monopolies are efficient. Answer: B Explanation: Since MC is often below ATC, pricing at MC would not cover total costs, requiring a subsidy. Question 45. The “essential facilities doctrine” in antitrust law is concerned with: A) Protecting patents from infringement. B) Preventing a firm that controls a vital input from denying access to competitors. C) Regulating price caps on utilities. D) Encouraging mergers that increase efficiency. Answer: B Explanation: The doctrine requires owners of essential facilities to provide access on reasonable terms. Question 46. In a monopoly, the consumer surplus is: A) Always zero. B) The area between the demand curve and the price line up to the quantity sold. C) Equal to producer surplus.
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D) Independent of the price set by the monopolist. Answer: B Explanation: Consumer surplus is the difference between what consumers are willing to pay (demand curve) and what they actually pay. Question 47. Which of the following best describes “horizontal differentiation” in monopolistic competition? A) Firms produce identical products. B) Firms produce products that differ in features or quality. C) Firms operate at different stages of production. D) Firms merge to reduce competition. Answer: B Explanation: Horizontal differentiation refers to differences in product characteristics, not price. Question 48. A monopolist’s profit (π) can be expressed as: A) TR – TC B) AR – MR C) MC – AVC D) P – MC Answer: A Explanation: Profit equals total revenue minus total cost. Question 49. Which of the following is NOT a typical reason for government regulation of monopolies? A) To protect consumers from excessively high prices. B) To ensure firms earn monopoly rents indefinitely.
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A) Fixed costs increase with output. B) Average total cost declines as output rises due to spreading fixed costs. C) Variable costs increase faster than output. D) The firm faces a downward-sloping marginal cost curve. Answer: B Explanation: Economies of scale arise when larger output spreads fixed costs, lowering ATC. Question 53. In the context of antitrust analysis, a “market definition” typically involves: A) Identifying all firms in the economy. B) Determining the relevant product and geographic market. C) Calculating each firm’s profit margin. D) Setting price caps for each firm. Answer: B Explanation: Defining the relevant market is essential for assessing concentration and competitive effects. Question 54. A monopoly that practices “third-degree price discrimination” charges a lower price to students than to professionals. This is feasible because: A) Students have a more elastic demand. B) Professionals have a more elastic demand. C) Both groups have identical demand elasticities. D) The monopoly can charge any price it wants without restriction. Answer: A Explanation: Students typically have higher price sensitivity (more elastic), allowing lower prices to increase sales.
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Question 55. Which of the following statements about “price elasticity of demand” is true for a monopoly? A) It is always equal to –1. B) It determines the slope of the marginal revenue curve. C) It has no impact on the monopolist’s pricing decision. D) It is identical to the price elasticity faced by a perfectly competitive firm. Answer: B Explanation: MR = P(1 + 1/η); thus elasticity directly influences the MR curve’s position. Question 56. The “deadweight loss” triangle in a monopoly diagram is bounded by: A) The demand curve, marginal cost curve, and the price line. B) The marginal revenue curve, average total cost curve, and the price line. C) The average variable cost curve, marginal cost curve, and the demand curve. D) The supply curve, demand curve, and the price ceiling. Answer: A Explanation: DWL is the area between demand, MC, and the monopoly’s price (vertical line at Q*). Question 57. Which of the following best describes “price discrimination” that results in the monopolist capturing the entire consumer surplus? A) Second-degree discrimination. B) Third-degree discrimination. C) First-degree (perfect) discrimination. D) Uniform pricing.
