High School Economics Quiz: Marginal Changes
20 questions · exam conditions
0:00
Marginal ChangesQuestion 1 of 20

A consumer enjoys buying comic books and has purchased four this month. They decide not to purchase a fifth comic book because the enjoyment they would get from it is less than the price. Which of the following events would most likely cause this consumer to change their decision and purchase the fifth comic book?

The average price of all comic books they purchased this month decreases.
The store announces a 'buy one, get one free' sale starting next month.
The consumer receives an unexpected cash gift, increasing their total income.
The publisher releases a surprise issue featuring the consumer's favorite character.
← Back to quizzes

High School Economics Quiz

High School Economics Quiz: Marginal Changes

Practice Marginal Changes 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 Marginal Changes, 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

A consumer enjoys buying comic books and has purchased four this month. They decide not to purchase a fifth comic book because the enjoyment they would get from it is less than the price. Which of the following events would most likely cause this consumer to change their decision and purchase the fifth comic book?

  1. The average price of all comic books they purchased this month decreases.
  2. The store announces a 'buy one, get one free' sale starting next month.
  3. The consumer receives an unexpected cash gift, increasing their total income.
  4. The publisher releases a surprise issue featuring the consumer's favorite character. (correct answer)
Explanation: The consumer's decision is based on comparing the marginal benefit (enjoyment of the fifth book) to the marginal cost (its price). The decision changes if either the marginal benefit increases or the marginal cost decreases. Option D describes an event that would significantly increase the marginal benefit of the fifth book, making it more likely to exceed the price. A: The average price is irrelevant to the marginal decision of buying the next one. B: A sale next month would likely decrease, not increase, the incentive to buy the fifth book this month. C: While an income increase might lead to more comic book purchases eventually, it doesn't directly change the marginal benefit of the specific fifth issue compared to its price at the moment of decision.

Question 2

A software company is deciding whether to hire a tenth programmer. After analyzing the costs and expected productivity, the management team decides against it, concluding the cost of the tenth programmer exceeds their expected contribution to revenue. A week later, they reverse their decision and hire the tenth programmer. Which of the following provides the best marginal explanation for this change?

  1. The company's total profit from its existing nine programmers exceeded annual forecasts.
  2. A competing firm laid off several experienced programmers, increasing the local labor supply.
  3. The company secured a new, large client project requiring additional labor to meet the deadline. (correct answer)
  4. The average salary for programmers in the industry saw a slight decrease over the last quarter.
Explanation: The initial decision was that the marginal cost (salary of the 10th programmer) was greater than the marginal revenue product (their contribution to revenue). The decision changed because the marginal benefit of that programmer increased. Securing a new, large project (C) directly increases the revenue that an additional programmer can help generate, raising their marginal revenue product, likely above their marginal cost. B explains why the marginal cost (wage) might decrease, which is a plausible reason for the change, but an increase in labor supply doesn't guarantee the company can hire someone for less. C provides a direct impact on the marginal benefit side of the equation for the firm. A relates to total profit, not the marginal contribution of the next hire. D is about average salary, which is less relevant than the specific salary the company must pay for the tenth hire.

Question 3

A city council voted against funding the installation of a fifth traffic light on a busy street, arguing that the cost of $100,000 was not justified by the minor safety improvement it would provide over the existing four lights. Which development would be most likely to cause the council to change its decision at the margin?

  1. A report reveals the first four traffic lights cost only $80,000 each to install.
  2. A new federal program offers to cover 50% of the installation cost for new traffic safety devices. (correct answer)
  3. A nearby city with more traffic lights is shown to have a higher overall accident rate.
  4. The city's total budget for public works is increased by 10% due to higher tax revenue.
Explanation: The council's decision is a comparison of the marginal cost ($100,000) and the marginal benefit (minor safety improvement). The choice changes if the marginal cost decreases or the marginal benefit increases. Option B directly cuts the marginal cost to the city in half (from $100,000 to $50,000). This significant decrease in the marginal cost could make the marginal benefit of the fifth light seem worthwhile. A refers to a sunk cost, which is irrelevant to the future decision. C suggests the marginal benefit might be lower than expected or even negative. D increases the total budget but doesn't change the specific cost-benefit analysis of the fifth traffic light.

Question 4

A car manufacturer is producing 1,000 cars per week. The marginal cost to produce the 1,001st car is $20,000, and the car sells for $22,000. The company decides to increase production. However, it chooses not to increase production to 1,002 cars per week. This decision implies that the company estimates the marginal cost of the 1,002nd car to be...

  1. less than $20,000.
  2. equal to the average total cost of production.
  3. greater than or equal to $22,000. (correct answer)
  4. equal to the marginal revenue of the 1,001st car.
Explanation: A firm produces an additional unit as long as the marginal revenue (MR) from that unit is greater than or equal to its marginal cost (MC). Here, the price is the marginal revenue ($22,000). The firm produces the 1,001st car because its MR ($22,000) > MC ($20,000). The decision to not produce the 1,002nd car means the firm believes the profit condition will no longer hold for that unit. Therefore, they must estimate that the MC of the 1,002nd car will be greater than or equal to the MR of $22,000. This reflects the principle of rising marginal costs in the short run.

Question 5

An airline is selling seats on a flight. Ten seats are empty just before takeoff. The full ticket price is $400, and the average cost per passenger for the flight (including fuel, crew salaries, and airport fees) is $300. The airline decides not to offer any last-minute discounted tickets. What marginal calculation best explains this decision?

  1. The marginal cost of adding one more passenger is greater than $400.
  2. The airline believes offering discounts will lower the price that future full-fare passengers are willing to pay. (correct answer)
  3. The average cost of $300 per passenger is greater than any potential discount price.
  4. The total revenue from the flight is already sufficient to cover the total costs.
Explanation: The marginal physical cost of adding one more passenger to a plane with empty seats is very low (perhaps just a snack and a drink). The decision not to sell a cheap ticket is not based on this immediate marginal cost. Instead, it's a strategic decision where the long-run marginal cost includes the expected loss of revenue from future customers who will delay booking to get a discount. Option B correctly identifies this. The airline perceives the marginal cost of the discounted ticket as the forgone revenue from future full-fare passengers, and this perceived marginal cost is higher than the marginal benefit of the discounted ticket's price. A is incorrect, as the immediate marginal cost is very low. C is incorrect because decisions should not be based on average cost. D is irrelevant to the marginal decision of selling one more seat.

Question 6

A freelance writer accepts a project that pays $50 per hour. She decides to work 20 hours per week on this project, valuing her 21st hour of leisure more than $50. The client then offers a bonus, raising the pay for every hour worked beyond 20 to $75. How does this change the writer's marginal decision?

  1. The opportunity cost of leisure for the 21st hour decreases from $75 to $50.
  2. The marginal benefit of working the 21st hour increases, making it more likely she will work that hour. (correct answer)
  3. The average pay per hour for all hours worked increases, raising the total value of the project.
  4. The marginal cost of working the 21st hour increases because the work becomes more difficult.
Explanation: The writer's decision is a comparison between the marginal benefit of working an additional hour (the wage) and the marginal cost (the value of the forgone leisure). Initially, for the 21st hour, MB ($50) < MC (value of leisure). The bonus structure changes the marginal benefit for the 21st hour from $50 to $75. As stated in B, this increase in marginal benefit makes it more likely that it will now exceed the marginal cost, causing her to change her choice and work the extra hour. A has the opportunity cost change reversed. C discusses average pay, which is not the basis for the marginal decision. D incorrectly assumes the marginal cost changes, when it is the marginal benefit that is directly affected by the pay increase.

Question 7

A coffee shop currently closes at 6 p.m. The owner calculates that if they stay open for an additional hour, they will serve five more customers, generating $25 in revenue. The cost of labor and electricity for that hour is $30. The owner decides to maintain the 6 p.m. closing time. Which of the following changes would be least likely to alter the owner's decision at the margin?

  1. The city announces a street festival next week that is expected to draw large crowds in the evening.
  2. The shop's landlord announces a 10% reduction in the monthly rent, effective immediately. (correct answer)
  3. A new employee agrees to work the extra hour for a lower wage than current employees.
  4. The coffee bean supplier offers a discount on bulk orders, lowering the cost per cup served.
Explanation: The decision is based on comparing marginal revenue ($25) to marginal cost ($30). The decision will change if MR rises or MC falls. Rent (B) is a fixed cost, not a marginal cost. A reduction in rent lowers the average total cost but does not affect the cost of staying open one more hour, so it is the least likely to change the decision. A would increase marginal revenue. C would decrease the marginal cost of labor. D would decrease the marginal cost of goods sold for that hour. All three would make staying open more attractive.

Question 8

Due to diminishing returns, the marginal benefit a person gets from each additional hour of sleep per night decreases. A person currently sleeps for 7 hours and is considering sleeping for an 8th hour. They choose not to, deciding the benefit of that extra hour is not worth missing their morning workout. Which of the following would most likely cause them to change their mind and sleep for the 8th hour?

  1. They feel well-rested after 7 hours of sleep.
  2. They read an article stating that the average person needs 8 hours of sleep.
  3. They purchase a more comfortable mattress, increasing the total benefit of sleeping.
  4. Their gym announces it will be closed for renovations the next morning. (correct answer)
Explanation: The decision is a comparison between the marginal benefit of the 8th hour of sleep and its marginal cost (the forgone workout). The person's choice changes if MB rises or MC falls. The gym being closed (B) completely eliminates the marginal cost (the opportunity to work out), making it almost certain that the person will now choose the 8th hour of sleep, as its benefit is now compared to a much lower cost (e.g., just lying in bed). A confirms the initial decision. C increases total benefit but not necessarily the marginal benefit of the 8th hour relative to the workout. D refers to an average and is irrelevant to this individual's marginal choice.

Question 9

A firm is polluting a river and has the option to install scrubbers to reduce emissions. Installing the first scrubber has a low marginal cost and high marginal benefit (removes the most harmful pollutants). Each additional scrubber has a higher marginal cost and a lower marginal benefit. The firm installs three scrubbers and decides against installing a fourth. Why might a new government regulation cause the firm to install the fourth scrubber?

  1. The regulation requires all firms in the industry to have at least four scrubbers.
  2. The regulation bans the specific type of pollution the first three scrubbers were designed to remove.
  3. The regulation provides a lump-sum subsidy to all firms that use any type of scrubber technology.
  4. The regulation imposes a per-unit tax on the remaining pollution the firm emits. (correct answer)
Explanation: The firm stopped at three scrubbers because the marginal cost of the fourth was greater than its marginal benefit. The decision changes if MC falls or MB rises. A tax on remaining pollution (B) effectively increases the marginal benefit of abatement. By installing the fourth scrubber, the firm avoids paying the tax on the pollution it would have removed. This new 'avoided cost' adds to the marginal benefit, potentially making it greater than the marginal cost. A is a command-and-control regulation, not a marginal decision. C is a lump-sum subsidy, which doesn't affect the marginal cost of the fourth scrubber. D would mean there's no need for a fourth scrubber at all.

Question 10

A movie theater is half-full for a particular showtime. The manager decides not to lower ticket prices to attract more viewers, reasoning that it would devalue the tickets for future shows. An hour later, the manager changes their mind and announces a 50% discount for the remaining seats. This change in decision-making at the margin is best explained by:

  1. The marginal cost of admitting another viewer was initially high but then decreased.
  2. The opportunity cost of leaving a seat empty decreased as the showtime got closer.
  3. The manager's assessment of the long-term marginal cost (lost future revenue) decreased relative to the short-term marginal benefit. (correct answer)
  4. The total revenue from the showtime was below the threshold needed to cover the film's rental fee.
Explanation: This is a multi-step marginal analysis. The marginal cost of a discount has two parts: the immediate low cost of seating a person, and the long-term cost of training customers to wait for discounts. Initially, the manager felt this long-term MC was higher than the MB of a discounted ticket. As showtime nears, the chance to sell a full-price ticket disappears, and the certainty of an empty seat (zero revenue) becomes concrete. The marginal benefit of getting some revenue from the seat rises in importance, while the long-term cost seems less significant compared to the immediate gain. C captures this shift in the perceived balance between long-term marginal cost and short-term marginal benefit. A is wrong; the physical marginal cost is always low. B is phrased confusingly; the opportunity cost of an empty seat increases as it becomes certain it will remain empty. D is about total revenue, not the marginal decision for the next ticket.

Question 11

A manufacturing plant runs two shifts, producing 100 units per shift. Management considers adding a third, overnight shift. They calculate that due to higher wage requirements and lower efficiency, the marginal cost of production for the third shift would be higher than the product's selling price. They decide against it. What new circumstance would most plausibly change this marginal decision?

  1. A large, one-time rush order is received that carries a penalty for late delivery. (correct answer)
  2. Productivity on the first two shifts increases, lowering the average total cost of all units.
  3. The cost of raw materials used during all shifts decreases by 5%.
  4. The company invests in new machinery that improves the output of the first and second shifts.
Explanation: The initial decision is that for the third shift, MC > MR (price). To change this, MC must fall or MR must rise. A rush order with a penalty (B) effectively increases the marginal revenue of production. The benefit of running the third shift is not just the selling price of the units, but also the avoidance of the late penalty. This added benefit could raise the total MR above the MC for the third shift. A and D affect average cost and productivity on other shifts, not the marginal cost of the third shift. C lowers the marginal cost, but a large penalty (a significant increase in MR) is a more direct and powerful reason for a firm to undertake production that would otherwise be unprofitable at the margin.

Question 12

A student downloads five songs from a new album and listens to them. They have the option to download a sixth song for $0.99 but choose not to, feeling they have enough new music. This decision implies that the marginal utility of the sixth song is less than the utility of the $0.99. If the price of a different, preferred artist's new album drops from $10 to $5, how might this influence the student's original decision?

  1. It would decrease the marginal utility of the sixth song, making the student even less likely to buy it.
  2. It would increase the student's real income, making the $0.99 for the sixth song seem more affordable.
  3. It has no effect, as the decision about the sixth song is independent of other albums.
  4. It would increase the opportunity cost of spending $0.99 on the sixth song, reinforcing the decision not to buy it. (correct answer)
Explanation: This question tests how a change in the price of a substitute good affects a marginal decision. The preferred album is a substitute for the single song. When the price of the substitute falls, it becomes a more attractive use of the student's money. This increases the opportunity cost of buying the sixth song. The student could now put that $0.99 toward a much cheaper, preferred album. This higher opportunity cost (a form of marginal cost) makes the student even less likely to buy the single song. A is incorrect because the price change of a different product doesn't change the inherent utility of the song itself. B is a very minor income effect and less significant than the substitution effect described in D. C is incorrect because consumption choices are interdependent.

Question 13

A student has studied for an exam for three hours and is considering studying for a fourth. They decide against it, preferring to spend the time relaxing. This indicates that at the third hour, the marginal benefit of studying...

  1. was equal to its marginal cost, and for the fourth hour, the marginal benefit is expected to be lower than its marginal cost. (correct answer)
  2. was negative, so the total benefit of studying has already been maximized and is now decreasing.
  3. was less than the total benefit from three hours of studying, so further studying offers no advantage.
  4. was less than the average benefit of studying, making the fourth hour an inefficient use of time.
Explanation: Rational decision-making at the margin involves continuing an activity as long as marginal benefit (MB) exceeds or equals marginal cost (MC). The student stops after the third hour and chooses not to study for the fourth. This implies the decision for the fourth hour is that MB < MC (the benefit of a better grade is less than the benefit of relaxing). The optimal point was likely at three hours, where MB was approximately equal to MC. A correctly identifies this relationship for the fourth hour. B is an exaggeration; MB is likely positive but small, not negative. C confuses marginal and total benefit. D confuses marginal and average benefit; decisions are made based on marginal, not average, values.

Question 14

A consumer is choosing between buying an additional apple or an additional banana. The price of an apple is $2 and the price of a banana is $1. The consumer, having already consumed some of each, chooses to buy the banana. They later change their mind and decide to purchase the apple instead. Which of the following, assuming prices have not changed, would best explain this change in choice?

  1. The consumer's total satisfaction from all apples consumed is greater than their total satisfaction from all bananas.
  2. The marginal utility of the next banana fell while the marginal utility of the next apple rose.
  3. The consumer realizes that the marginal utility per dollar for the apple is now higher than for the banana. (correct answer)
  4. The price of oranges, a substitute fruit, increased, making all other fruits relatively cheaper.
Explanation: Rational consumers allocate their budget to maximize utility by comparing the marginal utility per dollar (MU/P) for different goods. Initially, the consumer chose the banana, implying MU_banana / $1 > MU_apple / $2. To change their mind and choose the apple, the inequality must reverse: MU_apple / $2 > MU_banana / $1. Option C states this condition directly. Option B is plausible, but C is more precise because the decision explicitly relies on the utility relative to the price. It's possible for the MU of the apple to rise and the MU of the banana to fall, but the choice only flips if their price-adjusted values change their relative ranking. A refers to total, not marginal, utility. D would affect the choice, but it doesn't describe the immediate condition for choosing the apple over the banana.

Question 15

A government agency is funding a research project. They have spent $10 million of a $12 million budget. An assessment reveals the project is unlikely to succeed. The agency decides to cut its losses and cancel the project, forgoing the final $2 million. What new information would most likely cause them to reverse this decision and spend the final $2 million?

  1. A report shows that similar cancelled projects in the past resulted in significant wasted resources.
  2. A rival nation's government announces it is starting a similar, competing research project.
  3. The lead scientists present a revised plan showing a high probability of a partial breakthrough if the final $2 million is spent. (correct answer)
  4. The agency's overall annual budget is unexpectedly increased, providing more funds for all projects.
Explanation: The $10 million is a sunk cost and irrelevant to the decision. The marginal decision is whether to spend the final $2 million (marginal cost). The initial decision to cancel implies the expected marginal benefit is less than $2 million. To reverse this, the expected marginal benefit must increase. Option C describes this: the new plan increases the expected benefit from spending the next $2 million, making it potentially worthwhile. A refers to past sunk costs, which is a fallacy. B might increase the incentive, but it doesn't directly change the expected value of the project itself. D is irrelevant to the cost-benefit analysis of this specific project's final stage.

Question 16

A consumer subscribes to three streaming services. They consider adding a fourth service but decide against it, as the monthly fee for the fourth service is greater than the enjoyment they expect to get from it. Which of the following would most likely cause the consumer to cancel one of their existing subscriptions rather than add a new one?

  1. The price of their preferred streaming service increases significantly. (correct answer)
  2. A new streaming service enters the market with more content than all others.
  3. The consumer's income decreases, forcing them to re-evaluate all expenses.
  4. All of their existing subscriptions announce a small, uniform price increase.
Explanation: This question asks what triggers a marginal change in the opposite direction (reducing consumption). The consumer keeps a service as long as its marginal benefit (enjoyment) is greater than or equal to its marginal cost (price). If the price of one service (A) increases significantly, its marginal cost now likely exceeds its marginal benefit, triggering a decision to cancel that specific service. This is a direct application of marginal analysis. B might cause them to substitute, but not necessarily cancel one. C is a plausible reason to cut back, but A provides a specific marginal calculation that has changed for one of the three services. D might cause them to cancel one, but since the price of their preferred service (implying highest marginal benefit) goes up in option A, it creates a clearer case for re-evaluation and potential cancellation than a small increase across the board.

Question 17

A video game company has spent $5 million developing a new game. Pre-release reviews are poor, and the marketing department projects that if they spend an additional $1 million on advertising, the game will generate $800,000 in total revenue. The company's initial decision is to cancel the launch and not spend the additional $1 million.

Based on the passage, which of the following events would most likely cause the company to change its mind and launch the game by spending the extra $1 million?

  1. The finance department determines the $5 million development cost has already been fully paid.
  2. A new market analysis suggests that with the extra $1 million in advertising, the game will generate $1.2 million in revenue. (correct answer)
  3. The lead developer argues that launching the game is necessary to justify the initial $5 million investment.
  4. The company's other games are performing exceptionally well, creating a large profit surplus for the year.
Explanation: The decision at the margin ignores sunk costs (the $5 million already spent). The marginal decision is: should we spend $1 million more (marginal cost) to get $800,000 back (marginal benefit)? Initially, the answer is no (MC > MB). The decision would change if the marginal benefit were to rise above the marginal cost. Option B presents this exact scenario: the new projected revenue (marginal benefit) is now $1.2 million, which is greater than the additional advertising cost (marginal cost) of $1 million. A and C are incorrect because they focus on the $5 million sunk cost, which is a common decision-making fallacy. D is irrelevant to the profitability of this specific project at the margin.

Question 18

A firm is considering investing in a new marketing campaign. The marginal cost of the campaign is $50,000. The firm's analysts are uncertain about the outcome, projecting that the marginal revenue could be anywhere from $40,000 to $80,000. The firm decides to proceed with the campaign. What does this decision imply about the firm's attitude toward risk?

  1. The firm is risk-neutral or risk-seeking, as the expected marginal benefit is likely at or above the marginal cost. (correct answer)
  2. The firm is risk-averse, as it is willing to invest despite the possibility of a loss.
  3. The firm is ignoring marginal analysis and focusing on the potential for high total revenue.
  4. The firm's decision is irrational because the marginal cost is greater than the lowest possible marginal benefit.
Explanation: The decision to proceed means the firm believes the expected marginal benefit is at least $50,000. The midpoint of the projected revenue range is $60,000 (($40k + $80k) / 2). If the firm is risk-neutral, it would proceed as long as the expected benefit ($60,000) exceeds the cost ($50,000). If the firm is risk-seeking, it would be even more willing to take the gamble. A risk-averse firm, however, would weigh the potential loss more heavily and might not proceed even if the expected value is positive. Therefore, the decision suggests the firm is not strongly risk-averse. A is a contradiction. C is a possibility but not the best economic explanation. D is incorrect; rational decisions under uncertainty are based on expected values, not worst-case scenarios.

Question 19

A restaurant owner keeps her business open from 8 a.m. to 9 p.m. She considers staying open until 10 p.m., but decides against it because the projected revenue from the extra hour is less than the costs of labor and utilities for that hour. If she later decides to stay open until 10 p.m., which of the following is the most likely reason?

  1. Her fixed costs, such as rent and insurance, have decreased for the month.
  2. A new late-night bus route begins operation with a stop directly in front of her restaurant. (correct answer)
  3. She calculates that the average hourly revenue for the entire day is higher than the costs of the extra hour.
  4. Several other restaurants in the area have recently closed down permanently.
Explanation: The decision to stay open for an extra hour is a marginal one. The owner compares the marginal revenue (revenue from 9 to 10 p.m.) with the marginal costs (labor, utilities for that hour). The decision changes if the marginal revenue increases or marginal costs decrease. A new bus stop (B) would likely increase the number of potential customers during that late hour, thus increasing the marginal revenue and potentially making it profitable. A is incorrect because fixed costs are not part of the marginal cost of staying open one more hour. C is incorrect because decisions are made at the margin, not based on averages. D might increase her overall business, but it doesn't specifically guarantee that the 9-10 p.m. hour will become profitable.

Question 20

A farmer is currently using 100 pounds of fertilizer on a field and decides not to add an additional 10 pounds. According to marginal analysis, what would cause the farmer to reverse this decision?

  1. The total crop yield from the first 100 pounds of fertilizer was higher than last year.
  2. The price of fertilizer falls, and the market price for the farmer's crop rises. (correct answer)
  3. The farmer reads a study showing that, on average, farms use 150 pounds of fertilizer.
  4. The farmer has already paid for the 100 pounds of fertilizer and cannot return it.
Explanation: The farmer's decision not to add more fertilizer means the marginal cost of the extra 10 pounds (the price of the fertilizer) is greater than the marginal benefit (the value of the extra crop yield it would produce). To change this decision, the marginal cost must fall or the marginal benefit must rise. Option B describes both of these changes: the price of fertilizer (marginal cost) falls, and the market price of the crop (which determines the value of the extra yield, i.e., the marginal benefit) rises. A is about total yield, not the marginal yield from the next 10 pounds. C refers to an average, which is not relevant to this specific field's marginal decision. D describes a sunk cost, which is irrelevant to the decision of whether to add more fertilizer.