economics beginner 10 sample questions

Market Structures MCQ Practice Test

Competition types and characteristics

Q1. A firm is considering introducing a new product in a market where its current product is a close substitute for the new product. The new product has a higher price elasticity of demand than the current product. Which of the following market structures is most likely to exist in this market?

Explanation: In a monopolistically competitive market, there are many firms producing differentiated products, leading to a high degree of product differentiation. This results in a higher price elasticity of demand, as consumers are more likely to switch between products in response to changes in price. The fact that the new product has a higher price elasticity of demand than the current product supports this conclusion.

Q2. A monopolistically competitive firm faces demand with a constant price elasticity of -2. Its marginal revenue at any positive price equals ____ times price.

Explanation: MR = P(1 + 1/E) with E = -2 gives MR = P(1 − 0.5) = 0.5P — marginal revenue is half the price because selling more requires lowering the price on all units.

Q3. In long-run equilibrium, free entry of rivals drives a monopolistically competitive firm to earn what?

Explanation: As long as incumbents earn positive economic profit, new differentiated entrants attract customers, shifting each firm's demand left until price equals ATC (tangency with the demand curve). Profit is zero, though price remains above marginal cost.

Q4. In a Cournot duopoly with identical cost functions and a homogeneous product, if Firm A expects Firm B to produce a certain quantity, and Firm B expects Firm A to produce a certain quantity, what will be the resulting Nash equilibrium production quantity for each firm?

Explanation: In a Cournot duopoly, each firm chooses its quantity to maximize its profit, taking the other firm's output as given. The Nash equilibrium is reached when neither firm can improve its profit by unilaterally changing its output. The firms' expectations about each other's output will influence their production decisions, but the equilibrium quantity will not necessarily be the same as the expected quantity. The exact quantity depends on the specific demand and cost functions, but it will be a quantity that is different from what each firm expects the other to produce.

Q5. If the government imposes a per-unit tax on a monopolistically competitive firm's output, the short-run effect is typically that the firm ____.

Explanation: A per-unit tax shifts marginal cost upward. The firm equates MR with the higher MC at a lower quantity, and the demand curve then supports a higher price — output falls and price rises, typically by less than the tax.

Q6. In long-run equilibrium, which statement about a monopolistically competitive firm is correct?

Explanation: Tangency of demand and ATC gives zero economic profit (P = ATC), while the downward-sloping demand curve means P > MR = MC — the hallmark inefficiency (excess capacity) of monopolistic competition.

Q7. A perfectly competitive firm in the long run will produce at a point where its marginal cost curve intersects its

Explanation: In the long run, a perfectly competitive firm produces where price (which equals marginal revenue and average revenue) equals marginal cost, and where average total cost is at its minimum. This point is also where the marginal cost curve intersects the marginal revenue curve.

Q8. A firm operating in a monopolistically competitive market faces a downward-sloping demand curve. Under what condition would the firm's demand curve become perfectly elastic, effectively behaving as a price taker?

Explanation: A perfectly elastic demand curve means that consumers are extremely sensitive to price changes. If a firm's product has many perfect substitutes, even a small price increase will cause consumers to switch to those substitutes, resulting in the firm losing all its sales. This forces the firm to accept the market price, behaving as a price taker. The other options describe scenarios that would result in a downward-sloping demand curve or market power.

Q9. A firm in a monopolistically competitive market cannot sell all it wants at the going price. Why?

Explanation: Unlike a perfectly competitive firm (horizontal demand), a monopolistically competitive firm's brand loyalty is limited: price rises drive some buyers to close substitutes, so its demand curve slopes downward.

Q10. A monopolistically competitive firm faces a downward-sloping demand curve due to product differentiation. In the long run, new firms will enter the market if existing firms are earning economic profits. Which of the following statements best describes the firm's long-run equilibrium?

Explanation: In the long run, new firms will enter the market if existing firms are earning economic profits, driving down prices and eliminating profits. The firm will produce where marginal revenue (MR) equals marginal cost (MC) to maximize profits, and price (P) will equal average total cost (ATC), resulting in zero economic profit.

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Market Structures MCQ Practice Test | Mind Hustle