Market Structures

114 questions

Question 21Question

In an oligopolistic market, when a small number of major firms cooperate with one another to fix prices and restrict total industry output rather than competing, what economic term describes this agreement?

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Answer: Collusion

Answer

Collusion
Collusion refers to explicit or secret agreements between rival firms in an oligopoly to restrict competition, fix prices, and control market supply, effectively allowing them to maximize combined industry profits.

Step-by-Step Solution

1
Identify the key market behavior described in the question
The prompt describes mutual cooperation among dominant oligopolistic firms to fix prices and control supply.
Identifying the specific inter-firm behavior helps match it to standard economic terminology.
2
Match the behavior to its defined economic concept
The practice of competing firms agreeing to restrict rivalry by fixing prices or market shares is termed collusion.
Collusion allows oligopolists to eliminate price uncertainty and jointly act as a monopoly.

Key Concept

Collusion and Cartels in Oligopoly
Question 22Question

In a perfectly competitive market structure, because an individual firm faces a perfectly elastic demand curve at the prevailing market price, the aggregate industry demand curve is also perfectly elastic.

Show answer & explanation

Answer: False

Answer

The statement is False. In perfect competition, an individual firm faces a horizontal (perfectly elastic) demand curve because it is a price taker, but the aggregate industry demand curve is downward-sloping.
The statement is false because an individual firm's perfectly elastic demand curve stems strictly from its price-taker status in a market of numerous small producers, whereas the aggregate industry demand curve slopes downward from left to right in accordance with the law of demand.

Step-by-Step Solution

1
Examine the demand curve facing an individual firm under perfect competition.
Because an individual firm produces an insignificant fraction of total market output and sells a homogeneous product, it cannot influence price and faces a horizontal demand curve where P=MR=ARP = MR = AR (price elasticity of demand is infinite).
Firm price-taking behavior dictated by market assumptions.
2
Examine the aggregate market/industry demand curve.
The industry demand curve is derived from the horizontal summation of all individual consumer demand curves in the market and slopes downward from left to right.
Law of demand applies at the aggregate market level.
3
Evaluate the relationship between firm-level elasticity and industry-level elasticity.
Equating the individual firm's price-taker demand curve elasticity with the industry's demand curve elasticity is economically incorrect.
Market price is determined by the intersection of downward-sloping market demand and upward-sloping market supply.

Key Concept

Distinction between firm demand curve (perfectly elastic) and industry demand curve (downward-sloping) under perfect competition.
Question 23Question

In comparing market structures, which condition indicates that a market achieves allocative efficiency and maximizes consumer welfare?

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Answer: Price equals marginal cost (P=MCP = MC)

Answer

Price equals marginal cost (P=MCP = MC)
Allocative efficiency requires that the value consumers place on the final unit produced equals the cost of the resources used to make it (P=MCP = MC). This ensures maximum net social benefit and consumer welfare.

Step-by-Step Solution

1
Identify the economic definition of allocative efficiency.
Allocative efficiency occurs when resources are allocated to produce the exact combination of goods and services most desired by society, which requires that the price consumers pay equals the marginal cost of production (P=MCP = MC).
Price reflects the marginal benefit to consumers, while marginal cost reflects the opportunity cost of producing the last unit.
2
Evaluate market structures using this efficiency condition.
Perfect competition achieves P=MCP = MC in long-run equilibrium because competitive firms face a horizontal demand curve (P=MRP = MR). Imperfect markets, such as monopolies, charge a price higher than marginal cost (P>MCP > MC).
Monopolists restrict output to maximize profit where MR=MCMR = MC, resulting in price exceeding marginal cost and causing a loss of consumer welfare.

Key Concept

Allocative Efficiency in Market Structures
Question 24Question

Suppose a firm operates in a market characterized by a large number of buyers and sellers, complete freedom of entry and exit, and identical products. If this firm decides to set its selling price slightly above the prevailing market equilibrium price, what will be the immediate economic consequence?

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Answer: The firm will lose all of its sales because buyers have perfect knowledge and access to identical substitutes at the market price.

Answer

The firm will lose all of its sales because buyers have perfect knowledge and access to identical substitutes at the market price.
In a perfectly competitive market, individual firms are price takers facing a horizontal, perfectly elastic demand curve. Because all goods are homogeneous and buyers have perfect information, setting a price above market equilibrium forces buyers to switch completely to rival sellers, reducing the price-raising firm's sales to zero.

Step-by-Step Solution

1
Identify the market structure from the given assumptions
The market satisfies all conditions of perfect competition (homogeneous products, many buyers/sellers, perfect mobility, and perfect information).
These characteristics mean no single firm has market power to influence price.
2
Determine the price elasticity of demand facing an individual firm
The demand curve facing the firm is perfectly elastic (horizontal) at the market price.
Because goods are perfect substitutes, consumers will switch immediately to other sellers if one seller raises its price.
3
Evaluate the outcome of charging above the market price
Quantity demanded for this firm drops to zero.
As a price taker, the firm can sell any amount at the prevailing price, but zero at any price higher than the market price.

Key Concept

Perfect Elasticity of Individual Demand in Perfect Competition
Estimated Time:1m 30s
Question 25Question

Which type of market is specifically concerned with the exchange of short-term financial instruments such as Treasury bills and commercial papers?

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Answer: Money market

Answer

Money market
The money market is the institution or mechanism through which short-term debt instruments with high liquidity and maturities of less than one year—such as Treasury bills, commercial papers, and call money—are traded.

Step-by-Step Solution

1
Analyze the nature of the listed instruments
Treasury bills and commercial papers are short-term financial assets with maturities under one year
Classification of financial markets depends on the maturity duration of traded instruments
2
Classify the financial market by instrument maturity
The money market is defined as the market for short-term debt instruments and liquidity management
Short-term funds are borrowed and lent exclusively in the money market

Key Concept

Classification of markets by financial instrument maturity
Question 26Question

In the long-run equilibrium of a perfectly competitive market, a firm earns supernormal profit because price exceeds average total cost.

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Answer: False

Answer

False. In the long-run equilibrium of a perfectly competitive market, firms earn only normal profit (zero economic profit) because price equals minimum average total cost (P=ATCP = \text{ATC}).
The statement is false because free entry and exit under perfect competition drive economic profit down to zero in the long run. At long-run equilibrium, price equals minimum average total cost (P=ATCP = \text{ATC}), so firms make only normal profit.

Step-by-Step Solution

1
Examine the role of entry and exit in a perfectly competitive market.
Freedom of entry allows new firms to join the market whenever short-run economic profits exist (P>ATCP > \text{ATC}).
New entry increases industry supply and lowers market price.
2
Determine the long-run equilibrium price and profit state.
Price drops until P=ATCP = \text{ATC}, where economic profit becomes zero.
Firms achieve long-run equilibrium earning only normal profit.

Key Concept

Long-Run Equilibrium under Perfect Competition
Estimated Time:45s
Question 27Question

In economic theory, a market is strictly defined as a physical geographical location where buyers and sellers must meet face-to-face to conduct transactions.

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Answer: False

Answer

False. In economics, a market does not require a physical space or face-to-face contact; it refers to any arrangement that brings buyers and sellers together to determine prices and trade.
The correct evaluation is false. Economics defines a market functionally rather than geographically; any system or medium through which buyers and sellers interact to determine prices and execute exchanges constitutes a market.

Step-by-Step Solution

1
Define the fundamental economic concept of a market.
A market is defined by the interaction of demand and supply forces to establish prices and facilitate exchange.
Establishing the core definition distinguishes economic markets from colloquial usage referring only to physical marketplaces.
2
Examine market classifications based on communication channels and medium of exchange.
Markets encompass physical structures (e.g., traditional retail markets) as well as virtual, electronic, or financial networks (e.g., stock markets, foreign exchange markets, e-commerce).
Evaluating different market structures confirms that physical presence is not a mandatory characteristic.
3
Conclude the truth value of the stem.
Because physical location is not a prerequisite for market formation, the assertion is false.
Completes the systematic evaluation of the statement.

Key Concept

Concept and Classification of Markets
Estimated Time:1m 0s
Question 28Question

In an agricultural sector exhibiting perfect competition, farmers can effortlessly reallocate land, labor, and capital from growing cassava to cultivated maize whenever the market price of maize rises, without facing financial penalties or geographic barriers. Which underlying assumption of a perfectly competitive market does this scenario illustrate?

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Answer: Perfect mobility of factors of production

Answer

Perfect mobility of factors of production
The correct answer is 'Perfect mobility of factors of production'. Perfect competition assumes that resources such as labor, land, and capital can freely move between industries and alternative uses without incurring transport costs, retraining hurdles, or artificial legal restrictions. When farmers switch inputs effortlessly from cassava to maize, they demonstrate this assumption in action.

Step-by-Step Solution

1
Analyze the market scenario described in the prompt
The scenario highlights inputs (land, labor, capital) shifting instantly and seamlessly from cassava production to maize production in response to price signals.
Identifying the central action in the scenario isolates whether the question addresses product characteristics, buyer/seller numbers, or factor movements.
2
Match the identified characteristic to the relevant economic assumption
Unrestricted, zero-cost movement of productive inputs across uses defines the assumption of perfect mobility of factors of production.
Under perfect competition, factors of production are fully mobile so that long-run adjustments occur seamlessly when relative profitability changes.

Key Concept

Perfect Mobility of Factors of Production
Question 29Question

In a market characterized by perfect competition, individual firms invest significantly in persuasive advertising to differentiate their products and gain a competitive advantage over rival producers.

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Answer: False

Answer

The statement is False. Under perfect competition, firms sell identical (homogeneous) products and consumers possess perfect market information, eliminating the need for non-price competition such as advertising.
The statement is false because under perfect competition, goods are identical (homogeneous) and market participants possess complete knowledge. Because each firm is a price taker and can sell all its output at the equilibrium market price, spending money on persuasive advertising is unnecessary and inefficient.

Step-by-Step Solution

1
Analyze the core assertion made in the statement regarding firm strategy.
The statement asserts that competitive firms engage in non-price competition (advertising) to differentiate homogeneous goods.
Identifying the tested economic assumption is necessary to verify the statement's validity.
2
Examine the assumptions of product homogeneity and perfect information in perfect competition.
All firms produce perfect substitutes, and consumers have full knowledge of product prices and qualities across all sellers.
Because goods are identical, consumers have no preference for one seller over another based on branding.
3
Evaluate the financial logic of advertising for a price-taking firm.
An individual firm faces a perfectly elastic demand curve at the market price, meaning it can sell any quantity without advertising. Spending on advertising would simply increase total cost without allowing the firm to charge a higher price.
Advertising is a feature of imperfect markets (monopolistic competition and oligopoly) where product differentiation exists.

Key Concept

Product Homogeneity and Perfect Information in Perfect Competition
Question 30Question

A cassava farming enterprise operates in a perfectly competitive market where the market price is $15\$15 per bag. At its current production of 2,0002,000 bags, the firm's average total cost (ATCATC) is $12\$12, marginal cost (MCMC) is $15\$15, and average variable cost (AVCAVC) is $9\$9. What total economic profit or loss is this enterprise earning, and should it alter its production output?

Show answer & explanation

Answer: An economic profit of $6,000\$6,000, and output should remain unchanged as profit is already maximized.

Answer

The enterprise earns an economic profit of $6,000\$6,000 and should keep output unchanged at 2,0002,000 bags.
Per-unit economic profit is the difference between price (P=$15P = \$15) and average total cost (ATC=$12ATC = \$12), which is $3\$3 per bag. Total profit for 2,0002,000 bags is $3×2,000=$6,000\$3 \times 2,000 = \$6,000. Because the firm is producing where price (marginal revenue) equals marginal cost (MR=MC=$15MR = MC = \$15), it is maximizing short-run profit and should not change output.

Step-by-Step Solution

1
Calculate profit per unit.
Profit per unit = PATC=$15$12=$3P - ATC = \$15 - \$12 = \$3.
Economic profit per unit is determined by the difference between the selling price and the average total cost.
2
Calculate total economic profit.
Total Profit = $3×2,000=$6,000\$3 \times 2,000 = \$6,000.
Multiplying per-unit profit by total output yields the total economic profit.
3
Evaluate the profit-maximization output condition.
MR=P=$15MR = P = \$15, which equals MC=$15MC = \$15.
Under perfect competition, price equals marginal revenue (P=MRP = MR). Output is maximized where MR=MCMR = MC. Since MR=MCMR = MC, the firm is already producing the optimal level of output.

Key Concept

Short-Run Profit Maximization in Perfect Competition
Question 31Question

If the market price falls below a perfectly competitive firm's short-run average total cost but remains above its average variable cost, the firm minimizes its losses by shutting down operations immediately.

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Answer: False

Answer

False. A perfectly competitive firm will continue operating in the short run to minimize losses as long as price covers average variable cost (P>AVCP > AVC), even if price is below average total cost (P<ATCP < ATC).
The statement is false because a firm minimizes losses by continuing production whenever market price covers average variable cost (P>AVCP > AVC). Because total fixed costs must be paid even at zero output, any excess revenue above variable costs reduces the overall loss compared to producing nothing.

Step-by-Step Solution

1
Analyze the firm's price and cost relationship in the short run.
The firm operates where AVC<P<ATCAVC < P < ATC. Total revenue exceeds total variable cost (TR>TVCTR > TVC), but does not cover total cost (TR<TCTR < TC).
This indicates that the firm is suffering an economic loss.
2
Compare total losses under operation versus total losses under shutdown.
If the firm shuts down, output is zero (Q=0Q = 0) and its loss equals total fixed cost (TFCTFC). If it operates, revenue covers all variable costs and part of fixed costs, making losses less than TFCTFC.
Fixed costs cannot be eliminated in the short run.
3
Formulate the short-run production rule.
The firm continues producing output where MR=MCMR = MC to minimize loss, shutting down only if P<AVCP < AVC.
The short-run shutdown threshold is determined by the minimum point of the average variable cost curve.

Key Concept

Short-Run Loss Minimization and Shutdown Rule in Perfect Competition
Question 32Question

Match each source of monopoly power on the left with its corresponding economic scenario on the right.

Click a left item, then click its matching right item

Items

Legal Monopoly (Patent Rights)
Natural Monopoly
Control of Raw Material Inputs
State Monopoly (Government Franchise)

Matches

Show answer & explanation

Answer

Legal Monopoly (Patent Rights) matches the pharmaceutical firm's exclusive statutory rights; Natural Monopoly matches the single water utility benefiting from extensive economies of scale; Control of Raw Material Inputs matches sole ownership of essential bauxite deposits; State Monopoly matches the government establishing a statutory public postal corporation.
Each barrier to entry defines a distinct mechanism creating monopoly power: legal monopolies arise from statutory patent grants; natural monopolies result from significant economies of scale in infrastructure-heavy sectors; raw material monopolies rely on key input ownership; and state monopolies are instituted by government decree.

Step-by-Step Solution

1
Analyze 'Legal Monopoly (Patent Rights)'
Identifies legal protection of innovation. Connects to the scenario involving statutory exclusive production of a patented medicine.
Patents prevent legal imitation of a product.
2
Analyze 'Natural Monopoly'
Identifies technical conditions where large setup costs create falling average costs across the entire market demand. Connects to the water grid scenario.
Natural monopolies exist due to substantial economies of scale rather than artificial entry barriers.
3
Analyze 'Control of Raw Material Inputs'
Identifies exclusive ownership of essential physical resources needed for production. Connects to the mining firm owning all bauxite deposits.
Rivals cannot compete if they are denied access to fundamental raw inputs.
4
Analyze 'State Monopoly (Government Franchise)'
Identifies government intervention establishing a sole enterprise by law. Connects to the public postal corporation established by state charter.
Government franchises restrict entry via legislation for strategic or public utility purposes.

Key Concept

Sources of Monopoly Power and Barriers to Entry
Question 33Question

Which of the following constitutes a primary legal source of monopoly power for a firm within an economy?

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Answer: The acquisition of an exclusive patent or legal copyright granted by the state

Answer

The acquisition of an exclusive patent or legal copyright granted by the state
State-issued patents, copyrights, and exclusive franchises are established legal barriers that restrict competitors from producing or selling the protected item, creating a legal monopoly.

Step-by-Step Solution

1
Identify the core definition of a legal source of monopoly power
Legal barriers to entry are restrictions imposed by government statutes, franchises, patents, or copyrights that grant a single firm the exclusive right to produce a good or service.
Monopoly power relies on strong entry barriers preventing potential competitors from entering the industry.
2
Evaluate the options against legal barrier criteria
Patents and copyrights explicitly create legal exclusivity protected by law, establishing a statutory monopoly.
Without government protection or legal title, other firms could replicate the product and eliminate monopoly control.

Key Concept

Sources of Monopoly Power and Legal Barriers to Entry
Estimated Time:1m 0s
Question 34Question

The table below shows the short-run total revenue and total cost schedules of a monopolist at various output levels:

Output (Units)Total Revenue (\text{N})Total Cost (\text{N})
10500350
20900500
301,200700
401,400950
501,5001,250

What is the profit-maximizing output level for this monopolist?

Show answer & explanation

Answer: 30 units

Answer

The profit-maximizing output level is 30 units.
Total profit equals Total Revenue minus Total Cost. Calculating profit for each level yields N150 at 10 units, N400 at 20 units, N500 at 30 units, N450 at 40 units, and N250 at 50 units. The highest profit of N500 is achieved at 30 units. Furthermore, expanding output from 20 to 30 units adds N30 to revenue and N20 to cost (MR > MC), whereas expanding from 30 to 40 units adds N20 to revenue and N25 to cost (MR < MC). Thus, 30 units is the optimal profit-maximizing output.

Step-by-Step Solution

1
Calculate Total Profit (TR - TC) for each output level.
Output 10: N500 - N350 = N150; Output 20: N900 - N500 = N400; Output 30: N1,200 - N700 = N500; Output 40: N1,400 - N950 = N450; Output 50: N1,500 - N1,250 = N250.
Profit is maximized at the output level where the positive gap between Total Revenue and Total Cost is greatest.
2
Verify using Marginal Revenue (MR) and Marginal Cost (MC) additions per 10-unit increment.
From 20 to 30 units: MR = N30, MC = N20 (MR > MC). From 30 to 40 units: MR = N20, MC = N25 (MR < MC).
The firm should expand output as long as MR exceeds MC, stopping at 30 units before MC exceeds MR.

Key Concept

Monopoly Short-Run Profit Maximization
Question 35Question

A profit-maximizing monopolist operating in short-run equilibrium will always earn supernormal profits whenever marginal revenue equals marginal cost.

Show answer & explanation

Answer: False

Answer

False. The condition where marginal revenue equals marginal cost (MR=MCMR = MC) determines the profit-maximizing or loss-minimizing output level. Whether the monopolist earns supernormal profit, normal profit, or incurs an economic loss depends on the relationship between market price (PP) and average total cost (ATCATC) at that output level.
The statement is false because setting marginal revenue equal to marginal cost (MR=MCMR = MC) is the necessary condition for determining the optimal output level. It allows a firm to either maximize total economic profit or minimize total economic loss. If market demand is weak or costs are high such that average total cost (ATCATC) is greater than price (PP) at MR=MCMR = MC, the monopolist will operate at a short-run loss.

Step-by-Step Solution

1
Identify the equilibrium condition for output determination in a monopoly.
A monopolist maximizes profit or minimizes loss by setting marginal revenue equal to marginal cost (MR=MCMR = MC).
At MR=MCMR = MC, the firm has no incentive to increase or decrease output because total profit is at its maximum (or total loss is at its minimum).
2
Analyze how profitability is determined at the equilibrium output level.
Profit per unit is calculated as price minus average total cost (PATCP - ATC).
If P>ATCP > ATC, the firm earns supernormal profit; if P=ATCP = ATC, it earns normal profit; if P<ATCP < ATC, it incurs a short-run economic loss.

Key Concept

Monopoly Short-Run Profit and Loss Equilibrium Conditions
Question 36Question

A monopolistic airline operates on two routes: Route X, which is primarily used by business travelers with a price elasticity of demand of 0.60.6, and Route Y, which is primarily used by vacationers with a price elasticity of demand of 2.22.2. To maximize total profit through third-degree price discrimination, how should the airline set its fares on these two routes?

Show answer & explanation

Answer: Charge a higher fare on Route X and a lower fare on Route Y.

Answer

Charge a higher fare on Route X and a lower fare on Route Y.
Under third-degree price discrimination, a firm maximizes profit by charging a higher price in sub-markets with lower price elasticity of demand and a lower price in sub-markets with higher price elasticity of demand.

Step-by-Step Solution

1
Analyze the price elasticity of demand for each route
Route X has inelastic demand (ed=0.6<1|e_d| = 0.6 < 1) and Route Y has elastic demand (ed=2.2>1|e_d| = 2.2 > 1).
Price elasticity indicates consumer sensitivity to changes in price.
2
Apply the third-degree price discrimination profit-maximization rule
Equate marginal revenues across markets (MRX=MRY=MCMR_X = MR_Y = MC), where MR=P(11/ed)MR = P(1 - 1/|e_d|).
Because consumers on Route X are less price-sensitive, a higher price increases total revenue with a relatively small drop in quantity demanded.
3
Determine the relative pricing strategy
Set a higher price on Route X and a lower price on Route Y.
This allocation captures greater consumer surplus and maximizes overall monopoly profit.

Key Concept

Third-Degree Price Discrimination and Elasticity Rule
Question 37Question

Match each degree of price discrimination on the left with its corresponding pricing strategy or market condition on the right.

Click a left item, then click its matching right item

Items

First-degree price discrimination
Second-degree price discrimination
Third-degree price discrimination

Matches

Show answer & explanation

Answer

First-degree price discrimination matches with charging each consumer their maximum willingness to pay; Second-degree price discrimination matches with charging different prices based on quantity blocks consumed; Third-degree price discrimination matches with charging different prices to distinct consumer groups based on price elasticity of demand.
First-degree price discrimination captures total consumer surplus by charging each individual buyer their maximum willingness to pay. Second-degree price discrimination uses tiered block pricing based on quantity consumed. Third-degree price discrimination segregates distinct consumer groups based on differing price elasticities of demand.

Step-by-Step Solution

1
Analyze First-degree price discrimination
First-degree price discrimination occurs when a monopolist charges every buyer the maximum price they are willing to pay.
This transfers the entire consumer surplus to the producer.
2
Analyze Second-degree price discrimination
Second-degree price discrimination involves tiered pricing or volume discounts depending on the quantity purchased.
Consumers self-select into pricing tiers based on block rates.
3
Analyze Third-degree price discrimination
Third-degree price discrimination separates buyers into independent sub-markets with distinct demand elasticities.
Higher prices are charged in market segments with lower price elasticity of demand.

Key Concept

Degrees and Mechanisms of Monopoly Price Discrimination
Question 38Question

In long-run equilibrium, a firm operating under monopolistic competition sets output where marginal revenue equals marginal cost, and its downward-sloping demand curve is tangent to its average total cost curve. Which of the following best describes the long-run outcome for this firm?

Show answer & explanation

Answer: The firm earns only normal profit and operates with excess capacity.

Answer

The firm earns only normal profit and operates with excess capacity.
In long-run equilibrium under monopolistic competition, freedom of entry ensures that firms earn only normal profits (P=ATCP = ATC). Because product differentiation gives each firm a downward-sloping demand curve, tangency with the U-shaped ATC curve occurs to the left of its minimum, resulting in excess capacity.

Step-by-Step Solution

1
Analyze entry and profit in the long run for monopolistic competition.
Free entry of firms attracts new producers whenever short-run economic profits exist, shifting the demand curve for each individual firm to the left until price equals average total cost (P=ATCP = ATC), yielding zero economic (normal) profit.
Free entry and exit is a key feature of monopolistic competition.
2
Determine the output level relative to the minimum average total cost.
Because the firm's demand (average revenue) curve is downward-sloping due to product differentiation, the point of tangency with the ATC curve occurs on the downward-sloping section of the ATC curve, to the left of its minimum point.
A downward-sloping line can only be tangent to a U-shaped curve at a point where the curve is sloped downward.
3
Identify the economic implication of this equilibrium point.
Producing to the left of the minimum point of the ATC curve means the firm produces less than the capacity-minimizing cost output level, creating excess capacity.
Excess capacity represents the difference between the profit-maximizing output and the output that minimizes average cost.

Key Concept

Long-Run Equilibrium and Excess Capacity in Monopolistic Competition
Question 39Question

Suppose a market demand function is given by P=1002QP = 100 - 2Q, where PP is the price in dollars and QQ is the output quantity. The market operates at a constant marginal cost of MC=$20MC = \$20 with no fixed costs. If this market transitions from perfect competition to a monopoly, by how much is consumer welfare (consumer surplus) reduced?

Show answer & explanation

Answer: $1,200

Answer

Consumer welfare (consumer surplus) is reduced by $1,200.
Under perfect competition, allocative efficiency is achieved where price equals marginal cost (P=MC=20P = MC = 20), yielding an output of 40 units and a consumer surplus of 12×(10020)×40=$1,600\frac{1}{2} \times (100 - 20) \times 40 = \$1,600. When monopolized, profit maximization requires setting marginal revenue equal to marginal cost (MR=MCMR = MC), where MR=1004QMR = 100 - 4Q. Solving gives Q=20Q = 20 units and a higher price of P=$60P = \$60. The new consumer surplus under monopoly is 12×(10060)×20=$400\frac{1}{2} \times (100 - 60) \times 20 = \$400. The total reduction in consumer welfare is $1,600$400=$1,200\$1,600 - \$400 = \$1,200.

Step-by-Step Solution

1
Calculate price, quantity, and consumer surplus under perfect competition.
Competitive price Pc=$20P_c = \$20, quantity Qc=40Q_c = 40 units, and consumer surplus CSc=$1,600CS_c = \$1,600.
In perfect competition, price equals marginal cost (P=MCP = MC). Setting 1002Q=20100 - 2Q = 20 yields Qc=40Q_c = 40. At Q=0Q = 0, the maximum willingness to pay is 100.Consumersurplusistheareaofthetriangle:100. Consumer surplus is the area of the triangle: \frac{1}{2} \times (100 - 20) \times 40 = 1,600$.
2
Derive the marginal revenue equation and calculate price and quantity under monopoly.
Monopoly quantity Qm=20Q_m = 20 units and monopoly price Pm=$60P_m = \$60.
Total revenue is TR=P×Q=100Q2Q2TR = P \times Q = 100Q - 2Q^2, so MR=1004QMR = 100 - 4Q. Setting MR=MCMR = MC gives 1004Q=20    Qm=20100 - 4Q = 20 \implies Q_m = 20. Substituting into the demand function yields Pm=1002(20)=60P_m = 100 - 2(20) = 60.
3
Calculate consumer surplus under monopoly.
Monopoly consumer surplus CSm=$400CS_m = \$400.
Consumer surplus under monopoly is the area between the demand curve and monopoly price: 12×(10060)×20=400\frac{1}{2} \times (100 - 60) \times 20 = 400.
4
Calculate the reduction in consumer welfare (consumer surplus).
Reduction in consumer surplus ΔCS=1,600400=1,200\Delta CS = 1,600 - 400 = 1,200.
Subtract monopoly consumer surplus from competitive consumer surplus (CScCSm=1,600400=1,200CS_c - CS_m = 1,600 - 400 = 1,200).

Key Concept

Monopoly Welfare Loss and Consumer Surplus Comparison
Estimated Time:2m 30s
Question 40Question

Match each market classification on the left with its defining operational characteristic or primary transaction focus on the right.

Click a left item, then click its matching right item

Items

Factor Market
Consumer Goods Market
Wholesale Market
Retail Market

Matches

Show answer & explanation

Answer

Factor Market matches productive input trading; Consumer Goods Market matches final consumption commodities; Wholesale Market matches bulk intermediary trading; Retail Market matches direct small-quantity sales to final consumers.
Each market type is matched correctly according to standard economic classification criteria: Factor Markets deal in productive inputs; Consumer Goods Markets handle finished commodities for end-users; Wholesale Markets facilitate bulk intermediary trading; and Retail Markets supply final consumers in small quantities.

Step-by-Step Solution

1
Identify the purpose of factor markets.
Factor markets deal in productive resources (inputs like labor, land, capital), matching with the statement on productive inputs.
Firms demand factors of production in factor markets to generate output.
2
Distinguish between consumer goods markets and factor markets.
Consumer goods markets deal in final products intended for household satisfaction, matching with final commodities exchange.
Unlike inputs, consumer goods directly yield utility to households.
3
Differentiate wholesale and retail market volumes.
Wholesale markets involve bulk trading between producers and intermediaries, whereas retail markets handle small-unit direct sales to end consumers.
Classification by volume of trade categorizes transactions into wholesale (bulk) and retail (small quantities).

Key Concept

Classification of Markets by Nature of Goods and Volume of Trade
Estimated Time:1m 15s
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