Reading 9: The Firm and Market Structures
50 questions available
Key Points
- Many firms, identical products, low barriers to entry.
- Firms are price takers with perfectly elastic demand.
- Profit maximization condition: P = MR = MC.
- Short-run supply curve is MC above AVC.
- Long-run equilibrium: Price = Minimum ATC; zero economic profit.
Key Points
- Many firms, differentiated products, low barriers to entry.
- Downward-sloping, elastic demand curves.
- Product differentiation via innovation and marketing.
- Long-run equilibrium: Price = ATC > MC (markup exists).
- Economic profits are zero in the long run.
Key Points
- Few firms, high barriers, interdependence.
- Kinked demand curve explains price stickiness.
- Nash equilibrium: No firm gains by unilaterally changing strategy.
- Collusion is more successful with fewer firms and similar costs.
- Dominant firm sets price; competitive fringe follows.
Key Points
- Single seller, unique product, very high barriers.
- Profit maximizer: Produce where MR = MC, price from demand curve.
- Price discrimination requires preventing resale and distinct customer groups.
- Natural monopoly: Economies of scale lead to a single supplier.
- Regulation aims to reduce deadweight loss (e.g., average cost pricing).
Key Points
- N-firm concentration ratio: Sum of top N market shares.
- HHI: Sum of squared market shares; more sensitive to mergers.
- Concentration does not guarantee pricing power.
- Barriers to entry are crucial for true market power.
- Market definitions (e.g., global vs. local) affect measures.
Questions
Which of the following market structures is characterized by a large number of firms producing identical products?
View answer and explanationIn a perfectly competitive market, the demand curve faced by an individual firm is best described as:
View answer and explanationA profit-maximizing firm in any market structure will expand production until:
View answer and explanationUnder perfect competition, a firm's short-run supply curve is represented by:
View answer and explanationIn the long run, firms in a perfectly competitive market will earn:
View answer and explanationA firm in perfect competition should shut down in the short run if price is less than:
View answer and explanationWhich of the following is a key characteristic of monopolistic competition?
View answer and explanationIn monopolistic competition, the demand curve faced by each firm is:
View answer and explanationLong-run equilibrium in monopolistic competition results in:
View answer and explanationAdvertising expenses are typically high for firms in monopolistic competition because:
View answer and explanationWhich market structure is characterized by a few firms and high interdependence?
View answer and explanationThe kinked demand curve model of oligopoly assumes that:
View answer and explanationIn the Cournot duopoly model, each firm determines its profit-maximizing quantity assuming that:
View answer and explanationA Nash equilibrium is reached when:
View answer and explanationIn the Stackelberg dominant firm model, the market price is determined by:
View answer and explanationWhich of the following factors makes a collusive agreement in an oligopoly more likely to be successful?
View answer and explanationA monopolist maximizes profit by producing the quantity where:
View answer and explanationWhich of the following is a necessary condition for a monopolist to practice price discrimination?
View answer and explanationCompared to a single-price monopoly, perfect price discrimination results in:
View answer and explanationA natural monopoly is characterized by:
View answer and explanationRegulating a natural monopoly by forcing it to set price equal to marginal cost usually requires:
View answer and explanationThe N-firm concentration ratio is calculated as:
View answer and explanationCalculate the 4-firm concentration ratio for an industry with five firms having market shares of 30 percent, 20 percent, 15 percent, 10 percent, and 25 percent.
View answer and explanationWhich of the following is a limitation of the N-firm concentration ratio?
View answer and explanationThe Herfindahl-Hirschman Index (HHI) is calculated as:
View answer and explanationIf two firms in an industry with market shares of 25 percent and 15 percent merge, the HHI will:
View answer and explanationOne limitation shared by both the N-firm concentration ratio and HHI is that they:
View answer and explanationWhich market structure generally has the lowest barriers to entry?
View answer and explanationAn industry with many firms, differentiated products, and some pricing power is best classified as:
View answer and explanationA market with a single seller and no close substitutes is a:
View answer and explanationIn the long run, a firm in perfect competition produces at a quantity where:
View answer and explanationWhich of the following is true about the supply function in an oligopoly?
View answer and explanationIf a monopolist engages in rent seeking, the social cost of monopoly:
View answer and explanationA permanent increase in demand in a perfectly competitive industry will eventually result in:
View answer and explanationIn the short run, if a perfectly competitive firm's marginal revenue is less than its marginal cost, it should:
View answer and explanationProduct innovation in monopolistic competition allows firms to:
View answer and explanationOver time, the market share of a dominant firm in an oligopoly is likely to:
View answer and explanationA firm operating in an oligopoly with a kinked demand curve believes that if it raises its price:
View answer and explanationIn the context of the kinked demand curve model, the marginal revenue curve:
View answer and explanationAccording to the Cournot model, as the number of firms in an oligopoly increases, the equilibrium market price:
View answer and explanationUnder the Stackelberg model, the 'leader' firm:
View answer and explanationCollusive agreements in an oligopoly are most likely to be successful when:
View answer and explanationIn the Dominant Firm Model, the dominant firm calculates its demand by:
View answer and explanationAverage cost pricing regulation for a natural monopoly typically forces the firm to:
View answer and explanationCompared to perfect competition, a monopoly creates a deadweight loss because:
View answer and explanationIf a market has an HHI of 0.1950, this indicates:
View answer and explanationWhich pricing strategy allows a monopolist to capture more consumer surplus?
View answer and explanationGame theory is most useful for analyzing which market structure?
View answer and explanationIn the short run, a firm in perfect competition will earn a normal profit when:
View answer and explanationWhich of the following is true regarding the long-run supply curve for a firm in perfect competition?
View answer and explanation