High School Economics Quiz: Market Failures
20 questions · exam conditions
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Market FailuresQuestion 1 of 20

In the health insurance market, if insurers are prohibited from considering pre-existing conditions and must charge everyone in an age group the same premium, a market failure can occur. This is because individuals with poor health are more motivated to buy insurance than healthy individuals. This phenomenon, where one party's hidden information affects participation, is called...

moral hazard.
price discrimination.
adverse selection.
monopolistic competition.
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High School Economics Quiz

High School Economics Quiz: Market Failures

Practice Market Failures in High School Economics with focused quiz questions that help you check what you know, review explanations, and build confidence with test-style prompts.

What this quiz covers

This quiz focuses on Market Failures, giving you a quick way to practice the rules, question types, and explanations that matter most for High School Economics.

How to use this quiz

Try each quiz question before looking at the correct answer. Use the explanations to review missed ideas, then come back to similar questions until the pattern feels familiar.

All questions

Question 1

In the health insurance market, if insurers are prohibited from considering pre-existing conditions and must charge everyone in an age group the same premium, a market failure can occur. This is because individuals with poor health are more motivated to buy insurance than healthy individuals. This phenomenon, where one party's hidden information affects participation, is called...

  1. moral hazard.
  2. price discrimination.
  3. adverse selection. (correct answer)
  4. monopolistic competition.
Explanation: The correct answer is C. Adverse selection occurs when there's an information asymmetry before a deal is made. Here, individuals know more about their own health status (hidden information) than the insurance company does. Those who know they are high-risk are more likely to buy insurance at the average price, while healthy people may find it too expensive. This can lead to a pool of insured people who are less healthy than average, driving up costs and potentially causing the market to unravel.

Question 2

A warranty offered on a used car is a market mechanism primarily designed to combat which type of market failure?

  1. Market power, by signaling that the seller is not a monopolist and is willing to compete on quality.
  2. Adverse selection, by providing a credible signal of the car's quality and reducing the buyer's risk. (correct answer)
  3. Moral hazard, by ensuring the new owner will take proper care of the vehicle after the purchase.
  4. Inefficient production, by forcing the original manufacturer to adhere to higher quality standards.
Explanation: The correct answer is B. The 'lemons problem' (adverse selection) arises because buyers cannot tell good used cars from bad ones. A warranty serves as a signal from the seller to the buyer that the car is of high quality. A seller of a low-quality car would be unwilling to offer a good warranty because the expected repair costs would be too high. This helps buyers overcome the information asymmetry.

Question 3

A single company controls the only high-speed internet service in a remote town. The company charges a price significantly above its marginal cost and serves fewer households than is socially optimal. This situation represents a market failure primarily because the company's market power allows it to...

  1. operate with higher production costs than would exist under competition, passing these costs to consumers.
  2. ignore the town's demand for internet service and produce an amount that maximizes its own operational convenience.
  3. create an inefficient outcome by restricting output to a level that maximizes its profit rather than total surplus. (correct answer)
  4. price its service at the marginal cost of production, which is too low to sustain its long-term operations.
Explanation: The correct answer is C. The core of market failure due to market power (like a monopoly) is that the firm maximizes its own profit, not the overall social welfare (consumer surplus + producer surplus). It does this by producing less and charging more than would occur in a competitive market, leading to an allocatively inefficient outcome and creating deadweight loss.

Question 4

In the market for used bicycles, sellers know the full history of their bikes, including any hidden defects like a cracked frame or worn-out gears. Buyers, however, can only assess the bike's superficial condition. As a result, many high-quality used bikes are withdrawn from the market.

The situation described in the passage leads to a market failure known as adverse selection. This failure occurs because...

  1. buyers' lack of information leads them to offer an average price, which is too low for sellers of high-quality bikes. (correct answer)
  2. sellers of low-quality bikes are legally required to disclose all hidden defects, but they frequently fail to do so.
  3. once a person buys a used bike, they are more likely to ride it recklessly, creating a moral hazard.
  4. the government imposes a price ceiling on used bikes, preventing sellers of high-quality bikes from earning a profit.
Explanation: The correct answer is A. This is a classic 'lemons problem.' Because buyers cannot distinguish good bikes ('peaches') from bad ones ('lemons'), they are only willing to pay a price reflecting the average quality. This price is often unacceptably low for the owners of high-quality bikes, causing them to exit the market. This leaves a disproportionate number of low-quality bikes, and the market functions inefficiently.

Question 5

An insurance company offers a policy for rental properties that covers all damages caused by tenants. The company finds that landlords who purchase this policy are less diligent about screening potential tenants for reliability and responsibility. This change in the landlords' behavior is an example of...

  1. market power.
  2. adverse selection.
  3. moral hazard. (correct answer)
  4. allocative efficiency.
Explanation: The correct answer is C. Moral hazard refers to the change in behavior that occurs after a contract is made because one party is insulated from risk. Here, once the landlords are insured against damages, their incentive to carefully screen tenants is reduced. This less-diligent behavior, which increases the risk for the insurance company, is a direct result of being insured.

Question 6

Which of the following describes a situation where market power is the primary cause of market failure?

  1. A farmer's market has dozens of vendors selling identical tomatoes, but no one can sell their tomatoes for more than the going rate.
  2. A software company with a unique, universally adopted operating system charges high prices for licenses and product upgrades. (correct answer)
  3. Consumers are unsure about the safety of various electric scooters, leading to low sales across all brands despite high potential demand.
  4. A factory pollutes a river, imposing cleanup costs on a town downstream, but does not factor these costs into its production decisions.
Explanation: The correct answer is B. The company's unique and universally adopted operating system gives it significant market power, similar to a monopoly. This power allows it to set prices well above marginal cost, leading to an inefficiently low quantity sold and creating deadweight loss. This is a direct consequence of market power.

Question 7

A city has two dominant ride-sharing companies. While they do not have a formal agreement, both companies tend to keep their prices high and avoid price wars, resulting in higher fares and fewer rides than if they competed vigorously. This market outcome is inefficient and constitutes a market failure stemming from...

  1. an information problem where riders cannot determine the true cost of a ride before booking it.
  2. the exercise of collective market power by the two firms, which mimics monopolistic behavior. (correct answer)
  3. moral hazard, as drivers become less careful once they have accepted a ride request from a passenger.
  4. adverse selection, as only the most desperate riders are willing to pay the high fares charged by the companies.
Explanation: The correct answer is B. This scenario describes an oligopoly where firms, even without explicit collusion, recognize their mutual dependence and act in ways that restrict output and keep prices high. This exercise of collective market power leads to an outcome closer to a monopoly than to perfect competition, resulting in deadweight loss and allocative inefficiency.

Question 8

In a labor market, an employer cannot easily distinguish between high-productivity and low-productivity job applicants. If the employer offers a wage based on the average productivity of all applicants, what is the most likely market failure that will occur?

  1. Moral hazard, as the low-productivity workers will have no incentive to improve their skills after being hired.
  2. Market power, as the employer can force all workers to accept a wage below their marginal revenue product.
  3. Adverse selection, as high-productivity workers may not accept the average wage, leaving a pool of mostly low-productivity workers. (correct answer)
  4. A market collapse, as the employer will eventually realize that no workers are worth the average wage and will stop hiring.
Explanation: The correct answer is C. This is an example of adverse selection in the labor market. The wage offered is based on average productivity. This wage may be unappealing to high-productivity workers, who know their value is higher. They may choose not to work for this employer. This leaves the employer with a workforce that is, on average, less productive than anticipated, leading to an inefficient outcome.

Question 9

In the context of market failures, a key distinction between adverse selection and moral hazard is that adverse selection relates to hidden characteristics before a transaction, while moral hazard relates to hidden actions after a transaction. Which situation illustrates adverse selection?

  1. A homeowner with fire insurance is less careful about leaving burning candles unattended in their house.
  2. A person who is a habitual risk-taker is more likely to purchase a low-deductible health insurance plan. (correct answer)
  3. A salaried employee spends time on social media during work hours when their boss is not looking.
  4. A bank that has been bailed out by the government makes riskier loans in the future.
Explanation: The correct answer is B. Adverse selection is a pre-contractual problem. The person's characteristic (being a risk-taker) is hidden from the insurer, but it makes them more likely to select a particular type of insurance plan. This leads to a pool of insured individuals who are riskier than the general population, causing a market failure. The other options describe moral hazard, which are changes in behavior after a contract or event.

Question 10

A pharmaceutical company holds an exclusive patent for a life-saving drug. The patent grants the company sole authority to produce and sell the drug for 20 years. This scenario results in a market failure because the patent creates...

  1. an information problem where consumers cannot accurately judge the drug's effectiveness and side effects.
  2. a form of market power that allows the firm to set a price above marginal cost, restricting access for some patients. (correct answer)
  3. an incentive for the company to produce a lower quality drug since consumers have no alternative choices.
  4. a situation of adverse selection where only the sickest individuals will attempt to purchase the drug.
Explanation: The correct answer is B. A patent is a government-granted monopoly. This market power allows the firm to act as a price-maker, setting a price well above the marginal cost of production. While this high price allows the firm to recoup research and development costs, it is a market failure because it leads to allocative inefficiency: some people who value the drug more than its production cost cannot afford to buy it. This creates deadweight loss.

Question 11

A large corporation hires a new CEO and provides her with a contract that includes a generous severance package (a 'golden parachute') that pays out even if the company performs poorly and she is fired. From an economics standpoint, this contract is most likely to create a market failure in the form of...

  1. adverse selection, because only CEOs who expect to perform poorly will be attracted to this type of contract.
  2. market power, because the CEO can now collude with other firms to set artificially high prices in the industry.
  3. moral hazard, because the CEO may be incentivized to take excessive risks, knowing her payout is secure. (correct answer)
  4. information asymmetry, because the shareholders cannot know the CEO's true level of talent before hiring her.
Explanation: The correct answer is C. Moral hazard occurs when one party changes their behavior to the detriment of another after a transaction has occurred. In this case, the 'golden parachute' insulates the CEO from the negative financial consequences of poor performance, potentially encouraging her to make overly risky decisions that could harm shareholders. The problematic behavior occurs after the contract is signed.

Question 12

A professional athlete signs a long-term, guaranteed contract. After signing, the athlete reduces their training effort, leading to a decline in performance. This situation is a market failure best characterized as...

  1. adverse selection, because the team may have unknowingly signed a player with a poor work ethic.
  2. an information problem, because it is impossible for any team to predict future player performance with certainty.
  3. market power, because the athlete is a unique talent and can command a salary above their marginal product.
  4. moral hazard, because the guaranteed contract reduces the athlete's incentive to perform at their peak. (correct answer)
Explanation: The correct answer is B. This is a clear case of moral hazard. The market failure is the change in behavior after the contract is signed. The guaranteed nature of the contract insulates the athlete from the financial consequences of reduced effort, creating a misalignment of incentives between the athlete (agent) and the team (principal).

Question 13

A property owner hires a contractor to renovate a bathroom. The property owner cannot constantly monitor the contractor's work. The contractor could use cheaper, lower-quality materials than specified in the contract to increase their profit margin. This potential for the contractor to engage in unobserved, self-interested behavior is a market failure known as...

  1. the principal-agent problem stemming from moral hazard. (correct answer)
  2. a natural monopoly because the contractor is the only one working on the job.
  3. adverse selection, as the owner may have unknowingly hired a dishonest contractor.
  4. the free-rider problem, as the contractor benefits without bearing the full cost.
Explanation: The correct answer is A. This is a classic principal-agent problem, which is a specific type of moral hazard. The principal (property owner) hires an agent (contractor) to perform a task. Because the principal cannot perfectly monitor the agent's actions, the agent may act in their own self-interest (using cheaper materials) at the expense of the principal. This is a post-contractual information problem.

Question 14

A firm achieves natural monopoly status because its long-run average costs continuously decrease as output increases. While this cost structure is efficient from a production standpoint, the firm's existence still represents a market failure because the unregulated firm will...

  1. inevitably become inefficient and see its average costs rise above those of potential competitors.
  2. produce at the point where price equals marginal cost, resulting in long-term economic losses.
  3. lack the information to know what price consumers are actually willing to pay for its product.
  4. maximize profit by setting a price higher than its marginal cost, leading to an under-allocation of resources. (correct answer)
Explanation: The correct answer is D. Even if a monopoly is 'natural' (i.e., it has the lowest production costs), it is still a market failure if left unregulated. Like any profit-maximizing firm with market power, it will produce where marginal revenue equals marginal cost and set the price according to the demand curve. This price will be above marginal cost, meaning the quantity produced is less than the socially optimal amount, leading to deadweight loss.

Question 15

A group of previously competing airlines forms a cartel, agreeing to coordinate flight schedules and set fares jointly. This action creates a market failure by establishing market power. The primary negative consequence of this market failure is that the cartel will...

  1. face higher average costs for fuel and labor than when the airlines were competing with one another.
  2. suffer from adverse selection as only the least efficient airlines will be willing to join the cartel.
  3. trigger a moral hazard problem where passengers become less careful about arriving for their flights on time.
  4. charge a higher price and offer fewer flights than would occur under competitive conditions. (correct answer)
Explanation: The correct answer is B. A cartel is a formal agreement among firms to act like a monopoly. By creating market power, the cartel can increase profits for its members by restricting the total industry output (offering fewer flights) and raising the price (charging higher fares). This leads to a deadweight loss, as mutually beneficial trades (people willing to pay more than the competitive price but less than the cartel price) do not occur.

Question 16

A town's only dentist retires. For months, the town has no dentist, causing residents to travel long distances for dental care. A new dentist eventually opens a practice. Which of the following statements correctly identifies why the period with no dentist was not a market failure due to market power?

  1. Because the absence of a provider is a supply issue, not an issue of a single provider abusing its market position. (correct answer)
  2. Because residents could still access dental care in other towns, so no single dentist had true market power.
  3. Because the new dentist that arrived did not charge prices significantly above the previous dentist's prices.
  4. Because market failure due to market power only occurs when prices are regulated by the government.
Explanation: The correct answer is A. Market failure due to market power occurs when a firm exists and uses its position to inefficiently price and restrict output. A complete lack of supply is a different problem—it's a market clearing at zero quantity for a period, not a market failure caused by the strategic behavior of a dominant firm. The problem was an absence of a market, not a poorly functioning one due to market power.

Question 17

A firm that is the sole producer of a specific type of microchip can set its price. In contrast, a wheat farmer operates in a perfectly competitive market and must accept the market price. The microchip firm's situation can lead to a market failure, whereas the wheat farmer's cannot, because the microchip firm...

  1. has the ability to influence the market price, leading it to produce a non-optimal quantity. (correct answer)
  2. faces inelastic demand for its product, while the wheat farmer faces perfectly elastic demand.
  3. is more likely to experience information problems regarding consumer preferences for its product.
  4. can earn a profit in the short run, while the wheat farmer can only break even.
Explanation: The correct answer is A. The defining characteristic of market power is the ability to influence price. The microchip firm, as a sole producer, will use this power to set a price above marginal cost by restricting output to the profit-maximizing level (where MR=MC). This output level is less than the socially optimal level (where P=MC), causing a market failure. The wheat farmer is a price taker and has no such power.

Question 18

Which of the following scenarios is the clearest example of a market failure due to an information problem?

  1. A restaurant in a tourist area charges very high prices because it knows most customers are visiting for only one day and will not return.
  2. An auto mechanic recommends an expensive and unnecessary repair to a customer who lacks technical knowledge about cars. (correct answer)
  3. A single company owns all the diamond mines in a country, allowing it to significantly influence the global price of diamonds.
  4. The price of gasoline increases sharply due to a disruption in the global supply chain, causing hardship for commuters.
Explanation: The correct answer is B. This is a classic case of asymmetric information. The mechanic (the expert) has more information than the customer. The mechanic can exploit this information gap to sell a service that is not actually needed, leading to an inefficient transaction where the cost outweighs the true benefit.

Question 19

The market for complex financial products, such as collateralized debt obligations, is often cited as being prone to market failure. This is primarily because...

  1. only a few large banks have the market power to create and sell these products, allowing them to charge excessive fees.
  2. the sellers of these products often have more information about the underlying risks than the buyers, creating an information imbalance. (correct answer)
  3. these products are non-rival and non-excludable, making them public goods that are under-provided by the market.
  4. the buyers of these products experience moral hazard, as they feel secure that the government will bail them out if the products fail.
Explanation: The correct answer is B. The complexity of these products creates a significant information asymmetry. The institutions creating and selling them have sophisticated models and deep knowledge of the assets involved, while buyers (even sophisticated ones) may struggle to fully assess the true risk. This information gap can lead to mispricing of risk and an inefficient allocation of capital, a classic market failure.

Question 20

A key difference between a market failure caused by market power and one caused by asymmetric information is that...

  1. market power leads to an inefficient quantity being produced, while asymmetric information affects only the price of the good.
  2. market power can be solved by government regulation, whereas problems from asymmetric information have no potential solutions.
  3. market power is a problem of overproduction of a good, while asymmetric information is a problem of underproduction.
  4. market power involves a single seller's influence over the market, while asymmetric information involves imbalances in knowledge between parties. (correct answer)
Explanation: The correct answer is B. This choice captures the fundamental distinction between the two types of market failures. Market power is about market structure and the ability of a firm (or firms) to manipulate price and quantity. Asymmetric information is about the characteristics of the transaction itself—specifically, that one party knows something relevant to the transaction that the other party does not. This difference in the source of the failure is critical.