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AP Microeconomics

AP Microeconomics Practice Test: Practice Test 1

Practice Test 1 for AP Microeconomics: real questions and explanations from the Varsity Tutors practice-test pool.

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Question 1 of 25

A new production process reduces unit costs. Based on the supply curves shown, which statement is consistent with the shift from S1 to S2?

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Question 1

A new production process reduces unit costs. Based on the supply curves shown, which statement is consistent with the shift from S1 to S2?

  1. At every price, producers are willing and able to supply a larger quantity (correct answer)
  2. At every price, producers are willing and able to supply a smaller quantity
  3. The shift occurs because the market price increased
  4. Quantity supplied decreases because demand decreased
  5. The shift shows a movement along the original supply curve due to a price change

Explanation: This question tests your understanding of supply shifts and their economic interpretation when production costs decrease. Supply shows the entire price-quantity relationship, while quantity supplied is a specific amount at one price, and shifts occur when non-price factors change. The graph shows supply shifting right from S1 to S2, and when a new production process reduces unit costs, producers become more willing and able to supply at every price level because their profit margins improve. Choice A correctly states that "at every price, producers are willing and able to supply a larger quantity," which is the definition of a rightward supply shift. A critical misconception addressed by choice C is that price changes cause supply shifts, but price changes only cause movements along a curve, not shifts of the curve itself. To interpret supply shifts: rightward shifts mean more quantity supplied at each price (due to lower costs, better technology, or more sellers), while leftward shifts mean less at each price. The question's cost reduction scenario perfectly matches a rightward shift pattern.

Question 2

The primary goal of cost-benefit analysis in public policy decisions is to

  1. ensure that projects are completed under budget and ahead of schedule, maximizing contractor profits.
  2. choose the project that generates the most employment opportunities, regardless of the project's overall efficiency.
  3. select projects where the total social benefits are greater than the total social costs, thereby promoting allocative efficiency. (correct answer)
  4. identify and fund only those projects that can be paid for with current tax revenues without incurring any debt.

Explanation: Cost-benefit analysis is a systematic process for calculating and comparing the benefits and costs of a project, decision, or government policy. Its purpose is to determine if a decision is sensible in terms of its net benefit to society, which aligns with the goal of allocative efficiency.

Question 3

Peanut butter and jelly are considered complementary goods. If a new harvesting technique makes peanuts much cheaper to acquire, what will happen in the market for jelly?

  1. Both the equilibrium price and quantity of jelly will increase. (correct answer)
  2. Both the equilibrium price and quantity of jelly will decrease.
  3. The equilibrium price of jelly will increase, and the quantity will decrease.
  4. The equilibrium price of jelly will decrease, and the quantity will increase.

Explanation: Cheaper peanuts will increase the supply of peanut butter, lowering its price. Since peanut butter and jelly are complements, a lower price for peanut butter will increase the demand for jelly. An increase in demand for jelly will lead to a higher equilibrium price and a higher equilibrium quantity of jelly.

Question 4

A community’s market for flu vaccinations is shown in the graph. Vaccination reduces disease transmission, creating a positive externality. Based on the externality shown in the graph, what is the socially optimal quantity of vaccinations?

  1. Q=20Q=20Q=20 vaccinations, because it is where S=MPCS=MPCS=MPC intersects D=MPBD=MPBD=MPB
  2. Q=30Q=30Q=30 vaccinations, because it is where S=MPCS=MPCS=MPC intersects D=MSBD=MSBD=MSB (correct answer)
  3. Q=20Q=20Q=20 vaccinations, because it is where MSCMSCMSC intersects D=MPBD=MPBD=MPB
  4. Q=30Q=30Q=30 vaccinations, because it is where MSCMSCMSC intersects D=MSBD=MSBD=MSB
  5. Q=40Q=40Q=40 vaccinations, because it is where D=MPBD=MPBD=MPB intersects D=MSBD=MSBD=MSB

Explanation: This question tests your understanding of externalities and efficiency in markets. A positive externality occurs when consumption provides uncompensated benefits to third parties, like reduced disease transmission, while a negative externality imposes costs; marginal social benefit (MSB) equals marginal private benefit (MPB) plus external benefits, and marginal social cost (MSC) equals marginal private cost (MPC) plus external costs. The graph shows the MSB curve above the D=MPB demand curve due to the vaccination externality, with supply as S=MPC=MSC. The socially optimal quantity is Q=30 vaccinations, because it is where S=MPC intersects D=MSB, equating social benefits with costs for maximum welfare. A common misconception is that the market equilibrium equals the social optimum, but positive externalities cause underproduction as private benefits ignore external gains. To analyze similar problems, compare MSC to MSB on the graph. The efficient outcome occurs where MSC equals MSB.

Question 5

Using the PPC shown, which statement is true about point A compared with point B?

  1. Point A is unattainable, while point B is attainable.
  2. Point A is attainable but productively inefficient, while point B is productively efficient. (correct answer)
  3. Both point A and point B are productively efficient because they lie on the PPC.
  4. Both point A and point B are unattainable because they are above the PPC.
  5. Point A is productively efficient, while point B is attainable but productively inefficient.

Explanation: The skill being tested is interpreting the production possibilities curve (PPC). The PPC illustrates the maximum attainable combinations of two goods that an economy can produce given its resources and technology. Point A is inside the PPC, indicating attainability but inefficiency, while point B is on the curve, showing efficiency. Therefore, choice B is correct because the graph positions point A interiorly for inefficiency and point B on the frontier for efficiency. A common error is mislabeling inside points as efficient, but efficiency requires being on the PPC. To classify points on a PPC, remember that points on the curve are productively efficient, inside are inefficient but attainable, and outside are unattainable; shifts require resource or technology changes.

Question 6

A monopolist museum charges 5admissionforchildren(ages6–17)and5 admission for children (ages 6–17) and 5admissionforchildren(ages6–17)and20 admission for adults (ages 18+). The museum checks IDs at entry and does not allow ticket resale. Market research indicates adults have fewer close substitutes and therefore a less elastic demand than children. Based on the monopolist’s pricing strategy, which group is charged the higher price and why?

  1. Children, because the monopolist charges a higher price to the group with more elastic demand
  2. Adults, because the monopolist charges a higher price to the group with less elastic demand (correct answer)
  3. Children, because marginal cost of serving children is higher than serving adults
  4. Adults, because price discrimination requires knowing each adult’s exact willingness to pay
  5. Neither group, because charging different prices is impossible for a monopolist

Explanation: This question examines price discrimination, specifically how monopolists set prices based on demand elasticity differences between groups. The museum practices third-degree price discrimination by charging different prices to identifiable age groups: children pay 5whileadultspay5 while adults pay 5whileadultspay20. Adults have less elastic demand because they have fewer close substitutes for museum visits (children might prefer playgrounds, video games, or other activities), making them less price-sensitive. The monopolist maximizes profit by charging the higher price (20)tothegroupwithlesselasticdemand(adults)andthelowerprice(20) to the group with less elastic demand (adults) and the lower price (20)tothegroupwithlesselasticdemand(adults)andthelowerprice(5) to the more elastic group (children). The correct answer is B because monopolists always charge higher prices to less elastic consumers who are willing to pay more rather than forgo the product. A common error is reversing the elasticity relationship—remember that less elastic means less responsive to price, so these consumers will tolerate higher prices. The strategy for these problems is straightforward: identify which group has more substitutes (more elastic) and which has fewer substitutes (less elastic), then apply the rule that less elastic groups pay higher prices.

Question 7

A town has many coffee shops. Each shop sells coffee but differentiates through ambience, branding, and menu variety. New coffee shops can enter with modest startup costs, and each shop can raise price slightly without losing all customers. In contrast, a wheat market has many sellers of identical wheat and firms are price takers. Based on the market characteristics described, which market structure best fits the coffee shop market?

  1. Perfect competition, because entry is easy and firms are price takers
  2. Monopoly, because each firm sells a unique product with no close substitutes
  3. Oligopoly, because a few firms dominate the market and are interdependent
  4. Monopolistic competition, because many firms sell differentiated products with some price control (correct answer)
  5. Perfect competition, because products are identical across firms

Explanation: This question tests your understanding of imperfect competition in AP Microeconomics. Imperfect competition broadly describes market structures where firms have some degree of market power to influence prices, unlike perfect competition with many price-taking firms. In this scenario, the key feature is the coffee shop market having many firms with product differentiation through branding and modest entry costs. Therefore, choice D is correct because monopolistic competition involves many firms selling differentiated products with some price control and relatively easy entry. A common misconception is that all firms are price takers, but in imperfect competition like monopolistic competition, firms are price makers with limited pricing power. To identify market structures, count the number of firms and assess barriers to entry. Additionally, check the shape of the demand curve and look for product differentiation or barriers.

Question 8

A corn farmer operates in a perfectly competitive market and can sell any quantity of corn at the prevailing market price of $4\$4$4 per bushel. The demand curve faced by this individual farmer is

  1. perfectly elastic. (correct answer)
  2. perfectly inelastic.
  3. unit elastic.
  4. downward sloping.

Explanation: In a perfectly competitive market, individual firms are price takers. This means they face a horizontal demand curve at the market price. A horizontal demand curve signifies perfectly elastic demand, as the firm would sell zero units if it charged a higher price and can sell all it wants at the market price.

Question 9

Based on the monopolistically competitive firm’s situation, a small clothing brand sells differentiated T-shirts (unique designs). In the short run, it earns economic profit because at Q∗Q^*Q∗, price exceeds average total cost. In the long run, which feature explains why long-run profit is zero?

  1. The firm’s MCMCMC curve becomes tangent to the demand curve, forcing P=ATCP=ATCP=ATC at the profit-maximizing quantity.
  2. Free entry causes new firms to enter, shifting demand left until P=ATCP=ATCP=ATC where demand is tangent to ATCATCATC at MR=MCMR=MCMR=MC. (correct answer)
  3. The firm keeps profit because monopolistic competition is protected by government licensing and entry is blocked.
  4. The firm keeps profit because it can set price without any competitors, as in monopoly.
  5. The firm earns zero profit because products become identical, so it becomes a price taker with perfectly elastic demand.

Explanation: This question examines why monopolistic competition yields zero long-run profit. In monopolistic competition, firms offer differentiated products (unique T-shirt designs) with free entry/exit. The short-run profit (P>ATC at Q*) attracts new clothing brands with their own designs, shifting each existing firm's demand leftward as customers spread across more options. The key feature distinguishing monopolistic competition from monopoly is free entry—no government licensing or other barriers protect profits. Entry continues until each firm's demand curve becomes tangent to its ATC curve at the quantity where MR=MC, ensuring P=ATC and zero profit. A common error is thinking MC becomes tangent to demand; instead, demand becomes tangent to ATC. The strategy for these problems is to identify free entry as the driving force that shifts demand until tangency eliminates profit.

Question 10

Producer surplus in a market is best described as the

  1. total revenue that producers receive from selling a good minus the total variable cost of producing it.
  2. amount a seller is paid for a good minus the seller's marginal cost, summed over all units sold. (correct answer)
  3. excess of the quantity demanded over the quantity supplied when the market price is below the equilibrium price.
  4. total profit that firms earn when producing at the allocatively efficient level of output in the long run.

Explanation: Producer surplus is the total benefit sellers receive beyond their costs of production. It is calculated as the market price minus the marginal cost (or willingness to sell) for each unit, summed up. Choice A is incorrect because producer surplus is related to marginal cost, not just variable cost, and is not the same as quasi-profit. Choice C defines a market shortage. Choice D is incorrect because producer surplus is not the same as economic profit, as it does not account for fixed costs.

Question 11

A tax on gasoline is often considered regressive because...

  1. high-income individuals typically own more fuel-efficient hybrid or electric vehicles than low-income individuals.
  2. the revenue generated from the tax is used to fund projects that do not benefit low-income communities.
  3. low-income households generally spend a larger percentage of their total income on gasoline than high-income households. (correct answer)
  4. the tax is levied as a fixed amount per gallon, which prevents it from being progressive relative to income.

Explanation: A tax is regressive if it takes a larger percentage of income from people in lower-income groups than from those in higher-income groups. Because transportation costs, including gasoline, represent a larger share of a low-income family's budget, a gasoline tax has a disproportionately larger impact on them.

Question 12

A local utility company is a monopolist for electricity. It offers a two-part tariff: a monthly connection fee of 25plus25 plus 25plus0.10 per kilowatt-hour (kWh). All households face the same tariff, but households with higher willingness to pay for electricity tend to consume more kWh. Based on the monopolist’s pricing strategy, which type of price discrimination is illustrated?

  1. First-degree price discrimination, because each household is charged a personalized per-kWh price
  2. Third-degree price discrimination, because households are separated into identifiable groups with different prices
  3. Second-degree price discrimination, because the pricing scheme causes consumers to self-select by quantity demanded (correct answer)
  4. Uniform pricing, because every consumer pays the same total bill each month
  5. Third-degree price discrimination, because the firm must prevent arbitrage between households

Explanation: This question tests understanding of price discrimination in microeconomics. Second-degree price discrimination uses nonlinear pricing like two-part tariffs to let consumers self-select based on their consumption levels. Households with higher willingness to pay consume more kWh, effectively paying a higher total but lower average per-unit price, reflecting demand differences. Thus, the correct answer is C, as the tariff causes self-selection by quantity without group identification. A common misconception is viewing this as third-degree, but it lacks identifiable groups and relies on self-selection. A transferable strategy is to charge higher prices to consumers with less elastic demand to maximize profits. Always check if arbitrage is prevented, though in utilities it's inherent due to non-transferable service.

Question 13

If a 10% increase in the price of a smartphone leads to a 20% decrease in the quantity demanded, the price elasticity of demand for smartphones is

  1. −2.0-2.0−2.0, and demand is elastic. (correct answer)
  2. −0.5-0.5−0.5, and demand is inelastic.
  3. −20.0-20.0−20.0, and demand is elastic.
  4. −10.0-10.0−10.0, and demand is inelastic.

Explanation: Price elasticity of demand is calculated as the percentage change in quantity demanded divided by the percentage change in price. In this case, (−20%)/(10%)=−2.0(-20\%) / (10\%) = -2.0(−20%)/(10%)=−2.0. Since the absolute value of the elasticity (2.02.02.0) is greater than 1, demand is elastic.

Question 14

The long-run average total cost curve is often depicted as U-shaped. The upward-sloping portion of this curve reflects

  1. the law of diminishing marginal returns.
  2. the presence of diseconomies of scale. (correct answer)
  3. the increasing cost of fixed inputs.
  4. the benefits of labor specialization.

Explanation: The U-shape of the long-run average total cost (LRATC) curve is due to economies of scale causing the initial downward slope, and diseconomies of scale causing the eventual upward slope. The upward slope specifically indicates that as the firm expands its scale beyond a certain point, its average costs per unit begin to rise. Diminishing returns explains the shape of short-run cost curves. There are no fixed inputs in the long run.

Question 15

If government regulators require a natural monopoly to set its price equal to its marginal cost, the monopoly will likely...

  1. earn positive economic profits and increase its production level.
  2. earn zero economic profit, also known as a fair return.
  3. incur economic losses because price will be below average total cost. (correct answer)
  4. produce less output than it would if it were unregulated.

Explanation: For a natural monopoly, the long-run average total cost (LRATC) is downward sloping, which means the marginal cost (MC) curve must lie below the LRATC curve. If regulators enforce a socially optimal price where P=MCP = MCP=MC, the price will be less than the average total cost (P<ATCP < ATCP<ATC). This will cause the firm to suffer economic losses and, without a subsidy, it may shut down in the long run.

Question 16

A small call center produces resolved customer issues (single output) using labor as the variable input; its phone system and office space (capital) are fixed. Based on the production data shown, over which range of labor does the firm experience diminishing marginal returns?

Table: Total Product (TP) of Resolved Issues

Labor (L), workersTotal Product (TP), issues/hour
00
112
227
343
458
570
679
785
  1. From 0 to 2 workers
  2. From 2 to 4 workers
  3. From 4 to 7 workers (correct answer)
  4. From 1 to 5 workers
  5. From 3 to 6 workers

Explanation: This question focuses on the production function and the concept of marginal product of labor in AP Microeconomics. Marginal product (MP) is the additional output from hiring one more worker, and diminishing marginal returns refer to the stage where each additional worker adds less output than the previous one due to fixed capital. Using the provided table, we calculate MP for each worker: MP1=12, MP2=15, MP3=16, MP4=15, MP5=12, MP6=9, MP7=6, and identify where it begins to decrease after L=3. The firm experiences diminishing marginal returns from 4 to 7 workers because that's where MP starts declining, with MP4=15 < MP3=16, and continues to fall. Remember that total product (TP) is the cumulative output, not to be confused with marginal product, which measures the incremental contribution. To compute marginal product, always use the formula MP = ΔTP / ΔL, where ΔL is usually 1. Look for diminishing returns by observing when MP starts declining as labor increases while capital is fixed.

Question 17

A coastal town has an open-access fishery where any boat can fish without a permit. Each additional boat catching fish reduces the number of fish available for other boats, especially during peak season. Based on the characteristics described, which type of good is this?

  1. Public good
  2. Club good
  3. Private good
  4. Common resource (correct answer)
  5. Public good because it is available to everyone

Explanation: This problem tests your understanding of goods classification based on rivalry and excludability characteristics. Rivalry means one person's use diminishes what others can use, while excludability means non-payers can be prevented from accessing the good. The open-access fishery is rival (each boat catching fish reduces fish available for others) and nonexcludable (any boat can fish without permits or payment). A good that is rival and nonexcludable is classified as a common resource. Students often confuse common resources with public goods, but public goods are nonrival—one person's use doesn't reduce availability for others. To correctly classify any good, first ask 'does use by one person reduce what's left for others?' to test rivalry, then ask 'can the provider prevent non-payers from using it?' to test excludability.

Question 18

In the market for laptop computers, a decrease in demand is more than offset by a decrease in supply. Which of the following changes in equilibrium price and quantity is the most likely outcome?

  1. The equilibrium price will increase, and the equilibrium quantity will decrease. (correct answer)
  2. The equilibrium price will decrease, and the equilibrium quantity will decrease.
  3. The equilibrium price will be indeterminate, and the equilibrium quantity will decrease.
  4. The equilibrium price will increase, and the equilibrium quantity will be indeterminate.

Explanation: A decrease in demand pushes price and quantity down. A decrease in supply pushes price up and quantity down. Both shifts cause quantity to decrease, so the equilibrium quantity will definitely decrease. Since the decrease in supply (which pushes price up) is larger than the decrease in demand (which pushes price down), the net effect is an increase in the equilibrium price.

Question 19

A market for residential insulation services is shown in the graph. Better insulation reduces energy use and local air pollution, creating a positive externality. Based on the externality shown in the graph, what is the socially optimal quantity of insulation services?

  1. Q=15Q=15Q=15 services, because it is where S=MPCS=MPCS=MPC intersects D=MPBD=MPBD=MPB
  2. Q=25Q=25Q=25 services, because it is where S=MPCS=MPCS=MPC intersects MSBMSBMSB (correct answer)
  3. Q=25Q=25Q=25 services, because it is where MSCMSCMSC intersects MPBMPBMPB
  4. Q=15Q=15Q=15 services, because it is where MSCMSCMSC intersects MSBMSBMSB
  5. Q=35Q=35Q=35 services, because it is where MPBMPBMPB intersects MSBMSBMSB

Explanation: This question tests your understanding of externalities and efficiency in markets. A positive externality occurs when consumption provides uncompensated benefits to third parties, like reduced pollution from insulation, while a negative externality imposes costs; marginal social benefit (MSB) equals marginal private benefit (MPB) plus external benefits, and marginal social cost (MSC) equals marginal private cost (MPC) plus external costs. The graph shows the MSB curve above the D=MPB demand curve due to the energy-saving externality, with supply as S=MPC=MSC. The socially optimal quantity is Q=25 services, because it is where S=MPC intersects MSB, equating social benefits with costs for maximum welfare. A common misconception is that the market equilibrium equals the social optimum, but positive externalities cause underproduction as private benefits ignore external gains. To analyze similar problems, compare MSC to MSB on the graph. The efficient outcome occurs where MSC equals MSB.

Question 20

In a city, independent hair salons offer differentiated services (branding, styling experience) and compete in monopolistic competition. In the short run, one salon earns economic profit at its MR=MCMR=MCMR=MC output because P>ATCP>ATCP>ATC. Based on the monopolistically competitive firm’s situation, which feature explains why long-run economic profit is zero (one year) for the typical salon?

  1. Demand becomes perfectly elastic, forcing each salon to charge the market price equal to marginal cost.
  2. Barriers to entry prevent new salons from opening, so existing salons keep earning profit.
  3. Entry of new salons shifts each salon’s demand left until demand is tangent to ATCATCATC at the profit-maximizing output. (correct answer)
  4. The marginal cost curve becomes tangent to the demand curve, causing price to equal average total cost.
  5. Products become identical, so each salon becomes a price taker and earns zero profit.

Explanation: This question tests your understanding of monopolistic competition in AP Microeconomics. Monopolistic competition features many firms selling differentiated products, with free entry and exit in the long run. In the short run, a firm may earn economic profits if price exceeds average total cost at the MR=MC output, but in the long run, entry erodes these profits. Zero economic profit occurs because new firms enter, shifting each existing firm's demand curve leftward until it is tangent to the ATC curve at the profit-maximizing quantity. A common misconception is that monopolistic competition is like monopoly with permanent profits, but unlike monopoly, free entry ensures profits are temporary. To approach similar questions, always check for free entry as the key mechanism driving long-run adjustments. Look for the condition where the demand curve is tangent to ATC in the long-run equilibrium graph.

Question 21

Based on the changes described, the price of coffee increases by 10% while the price of tea is unchanged. Over the same period, the quantity demanded of tea increases by 2%. What does this imply about the cross-price elasticity of demand (XED) for tea with respect to the price of coffee, and what does it indicate about the relationship between tea and coffee?

  1. XED is negative; tea and coffee are complements.
  2. XED is positive; tea and coffee are substitutes. (correct answer)
  3. XED is zero; tea and coffee are unrelated.
  4. XED is positive; tea and coffee are complements.
  5. XED is negative; tea and coffee are substitutes.

Explanation: This question involves cross-price elasticity of demand (XED). XED measures how the quantity demanded of one good changes in response to a price change in another good, with a positive sign indicating substitutes and a negative sign indicating complements. Here, the price of coffee increases by 10%, and the quantity demanded of tea increases by 2%, while the price of tea remains unchanged. This results in a positive XED because the percentage change in quantity of tea is positive divided by the positive percentage change in price of coffee, implying tea and coffee are substitutes as demand for tea rises when coffee becomes more expensive. A common misconception is thinking small positive values mean unrelated goods, but any positive XED indicates substitution regardless of magnitude. To analyze similar problems, first determine the sign of XED by observing the direction of quantity change relative to the price change. Then, match the sign to the category: positive for substitutes, negative for complements, and zero for unrelated goods.

Question 22

Consider a monopolistically competitive firm that is earning positive economic profits in the short run. If the government imposes a lump-sum tax, what will be the immediate effect on the firm's price and quantity?

  1. Price will increase, and quantity will decrease.
  2. Price will decrease, and quantity will increase.
  3. Price and quantity will both remain unchanged. (correct answer)
  4. Price will remain unchanged, but quantity will decrease.

Explanation: A lump-sum tax acts as a fixed cost. It affects average total cost but does not change the firm's marginal cost or marginal revenue. Since a firm chooses its profit-maximizing price and quantity based on the intersection of its marginal revenue and marginal cost curves, these will not change in the short run. The firm's profits will decrease, but its price and output decision remains the same.

Question 23

If firms in a perfectly competitive industry are earning positive economic profits in the short run, which of the following will occur in the long run?

  1. The market demand curve will shift to the left, reducing the market price.
  2. Existing firms will exit the industry, causing the market price to rise.
  3. New firms will enter the industry, causing the market supply to increase and price to fall. (correct answer)
  4. The government will impose price ceilings to limit the excess profits.

Explanation: Positive economic profits act as a signal that attracts new firms. Because there are no barriers to entry in perfect competition, new firms will enter the industry. This entry increases the market supply, which shifts the supply curve to the right and causes the market price to fall until economic profits are competed away and return to zero.

Question 24

A market for table salt has many firms selling an identical product, and any firm that raises its price loses nearly all customers. A market for streaming music has a few large firms with differentiated platforms, and each platform can adjust subscription prices without losing all subscribers immediately. Based on the market characteristics described, which feature distinguishes imperfect competition in streaming music from perfect competition in table salt?

  1. Streaming music firms are price takers facing a perfectly elastic demand curve
  2. Streaming music firms sell identical products, so consumers view platforms as perfect substitutes
  3. Streaming music firms have some price-setting ability because their products are differentiated (correct answer)
  4. Streaming music firms have no fixed costs, so entry is costless
  5. Streaming music firms always earn zero economic profit in the short run

Explanation: This question tests your ability to distinguish imperfect competition from perfect competition based on product differentiation and price-setting ability. Imperfect competition occurs when firms have some control over price because they face downward-sloping demand curves for their products. The streaming music market exhibits imperfect competition because firms offer differentiated platforms (different features, music libraries, user interfaces) and can adjust prices without losing all subscribers immediately - indicating they face downward-sloping demand curves. The correct answer is C because product differentiation gives streaming firms price-setting ability, unlike table salt producers who are price takers selling identical products. A common misconception is thinking that any firm can set whatever price it wants, but imperfectly competitive firms are price makers who still face trade-offs - raising price reduces quantity demanded along their downward-sloping demand curve. To distinguish these market types, examine whether products are identical (perfect competition) or differentiated (often imperfect competition), and whether firms lose all customers when raising price slightly (perfect competition) or only some (imperfect competition). Product differentiation creates brand loyalty and gives firms market power.

Question 25

Based on the changes described, a consumer’s income falls by 20%. Over the same period, the quantity of used clothing demanded falls by 10%. Using income elasticity of demand (YED) for used clothing, which statement is correct?

  1. YED is negative; used clothing is an inferior good.
  2. YED is positive; used clothing is a normal good. (correct answer)
  3. YED is zero; used clothing is unrelated to income.
  4. YED is positive; used clothing is an inferior good.
  5. YED is negative; used clothing is a normal good.

Explanation: This question analyzes income elasticity of demand (YED) for used clothing. YED distinguishes normal goods (positive YED) from inferior goods (negative YED) based on how quantity demanded responds to income changes. When income falls by 20% and used clothing demand also falls by 10%, YED = (-10%)/(-20%) = +0.5. The positive sign classifies used clothing as a normal good—even when income decreases, the proportional decrease in demand confirms consumers view it positively. A common error is assuming used or second-hand goods must be inferior, but the data shows otherwise: both income and quantity move in the same direction (both falling), yielding positive YED. To avoid classification mistakes, always calculate the sign mathematically rather than relying on assumptions about product types. Same-direction movements always produce positive YED (normal goods).