Rationale: Opportunity cost is strictly the value of the single *next best* choice, not all rejected paths.
Question 5
Mr. McMahon has to choose between buying a senior prom suit or a 4-day Lollapalooza pass. If he chooses the prom suit, what is his opportunity cost?
A) The total cost of dry cleaning and tailoring his new prom suit.
B) The memory of dressing up and taking formal photos at his senior prom.
C) The enjoyment, music, and social experience of Lollapalooza with friends.
D) The cost of gas and parking at the downtown concert venue.
Rationale: McMahon gave up the next best option: attending the concert with his friends.
Question 6
A food truck uses commercial cooking grills, a trained grill cook, and rented parking space. What Factor of Production does the commercial grill represent?
A) Land
B) Labor
C) Capital
D) Entrepreneurship
Rationale: Grills are physical capital—manufactured goods used to produce other services/food.
Question 7
An individual conducting a cost-benefit analysis will rationally choose to take an action as long as:
A) The marginal benefit is strictly greater than the marginal cost (\(MB > MC\)).
B) The total cost has been fully subsidized by a government grant.
C) The marginal cost is greater than the total benefit.
D) The opportunity cost is reduced to absolute zero.
Rationale: Rational actors execute choices where additional benefit exceeds additional cost (MB > MC).
Question 8
Which of the following scenarios is the best real-world demonstration of "thinking at the margin"?
A) Choosing whether to buy a food truck or standard brick-and-mortar restaurant.
B) Deciding whether to study for a third consecutive hour or go to sleep.
C) Writing down a master checklist of all potential holiday gift options.
D) Calculating the overall corporate annual revenue of a grocery chain.
Rationale: Marginal thinking analyzes small, single-unit adjustments (e.g., adding +1 hour).
Economics Exam Teacher Keys • Form A Page 1 of 3
Teacher Grading Resource
Answer Key
Section II
Question 9
In economic terms, true "economic demand" does not exist for a product unless a consumer possesses:
A) The willingness (desire) to buy the item, regardless of budget resources.
B) High financial ability (disposable income), even if they completely dislike the product.
C) Both the psychological willingness to purchase AND the physical ability to pay.
D) A permanent need for the item as defined by government health standards.
Rationale: Demand is the intersection of desire (willingness) and resource (ability).
Question 10
Which of the following describes the Law of Demand?
A) As the price of a product increases, the quantity demanded increases.
B) As the price of a product increases, the quantity demanded decreases.
C) As buyer income rises, they purchase less of all standard normal goods.
D) As supply decreases, the price of products naturally drops.
Rationale: The Law of Demand defines an inverse (opposite) relationship of price and QD.
Question 11
When the price of a good drops, consumers feel wealthier because their purchasing power has increased. This concept is called the:
A) Substitution Effect
B) Income Effect
C) Determinant Effect
D) Equilibrium Shift
Rationale: The income effect details how purchasing power changes behavior without changing actual income.
Question 12
A food truck hikes its burger price to $15. Customers react by purchasing a $5 slice of pizza from a rival down the street. This demonstrates:
A) The Income Effect
B) The Substitution Effect
C) A Supply Shift
D) A Price Floor Surcharge
Rationale: Substitution effect is swapping a pricier product for a cheaper alternative.
Question 13
At every grocery store, the price of hot dogs has risen to an all-time high. How does this affect the market for hot dog buns (a complement)?
A) Demand for hot dog buns will shift right.
B) Demand for hot dog buns will shift left.
C) Quantity demanded of hot dog buns will rise along the curve.
D) The supply of hot dog buns will experience a massive increase.
Rationale: Complements are used together. High hot dog prices reduce demand for hot dog buns.
Question 14
Margarine and butter are close substitutes. If margarine goes on a massive sale, what is the expected shift in the butter market?
A) The demand for butter shifts to the right.
B) The demand for butter shifts to the left.
C) The supply of butter shifts to the right.
D) The price of butter experiences an immediate price floor.
Rationale: Margarine sale price drops its demand. Consumers switch from butter, shifting butter demand left.
Question 15
An electronics manufacturer announces television prices will increase by 30% in two months. What is the immediate effect on today's television demand?
A) Today's demand shifts left as consumers wait for the price hike.
B) Today's demand shifts right as consumers buy now to beat the hike.
C) Today's demand remains constant until the new pricing takes effect.
D) Today's supply shifts right to trigger an immediate surplus.
Rationale: Expected future price increases drive up immediate demand as consumers hoard/buy early.
Question 16
Bob is laid off from his job. If Top Ramen is an inferior good for Bob, how will his demand for Top Ramen change?
A) His demand shifts left as he cuts his basic food spending.
B) His demand shifts right because his income has decreased.
C) His quantity demanded drops to absolute zero immediately.
D) His demand curve remains unchanged as normal goods are preferred.
Rationale: By definition, as a buyer's income decreases, their demand for inferior goods shifts right.
Economics Exam Teacher Keys • Form A Page 2 of 3
Teacher Grading Resource
Answer Key
Section III
Question 17
According to the Law of Supply, business owners supply *more* items at higher price points because:
A) Higher prices naturally decrease their raw ingredient costs.
B) Higher prices make consumers much more eager to buy.
C) Higher prices offer greater potential for profit per unit.
D) Higher prices allow them to bypass government regulations.
Rationale: Revenue matches higher price tags, driving higher profit potential.
Question 18
If wholesale burger beef prices double, how will this input cost increase affect a food truck's supply of burgers?
A) Supply will shift to the left because costs of production have risen.
B) Supply will shift to the right due to positive supplier expectations.
C) The quantity supplied will increase along the original supply curve.
D) The overall consumer demand for burgers will shift right.
Rationale: Rising input costs reduce supplier profitability, shifting supply left.
Question 19
A kitchen purchases an auto-slicer vegetable machine that cuts prep time in half. This technological upgrade causes:
A) A leftward shift in the supply curve.
B) A rightward shift in the supply curve.
C) A leftward shift in the demand curve.
D) A permanent shortage of sliced ingredients.
Rationale: Superior manufacturing tech lowers physical production time, shifting supply right.
Question 20
A city council passes a mandatory $1.50 clean air tax on every generator transaction. This regulation will:
A) Shift the supply curve of food trucks to the left.
B) Shift the supply curve of food trucks to the right.
C) Shift the demand curve of food trucks to the right.
D) Cause a temporary surplus of diesel generators.
Rationale: Mandatory taxes behave as cost surges, driving a leftward supply curve shift.
Question 21
How does a government subsidy (cash grant) affect a producer's supply curve differently than a tax?
A) A subsidy shifts supply left; a tax shifts supply right.
B) A subsidy shifts supply right; a tax shifts supply left.
C) A subsidy shifts demand right; a tax shifts supply left.
D) Both shift supply left, but in different visual amounts.
Rationale: Subsidies act as negative costs (increasing supply), taxes act as added costs (decreasing supply).
Question 22
Market equilibrium is graphically and mathematically defined as the exact point where:
A) A price floor is set exactly at zero.
B) Quantity demanded equals quantity supplied (\(QD = QS\)).
C) The supply curve and demand curve become completely parallel.
D) Shortages and scarcities are permanently abolished from earth.
Rationale: Equilibrium occurs where curve paths intersect, meaning QD = QS.
Question 23
Suppose a food truck sets tacos at $8. At this price, quantity supplied is 100 tacos, but quantity demanded is only 10. This results in:
A) A shortage of 90 tacos.
B) A surplus of 90 tacos.
C) An equilibrium of 110 tacos.
D) A physical scarcity of resources.
Rationale: Overproduction relative to demand creates an excess (Surplus = QS - QD = 90).
Question 24
The mayor mandates that no food truck can charge more than $3 for any item. If market equilibrium is $6, this mandate is a ________ leading to a ________.
A) Price Floor; permanent surplus.
B) Price Ceiling; permanent shortage.
C) Price Floor; temporary shortage.
D) Price Ceiling; permanent surplus.
Rationale: Legal caps below equilibrium are price ceilings, forcing permanent market shortages.
Question 25
A price floor is a legal minimum price set ________ equilibrium, which prevents prices from falling and typically leads to a ________.
A) Below; permanent shortage.
B) Above; permanent surplus.
C) Below; temporary surplus.
D) Above; permanent shortage.
Rationale: Price floors mandate high prices set above equilibrium, causing producers to oversupply (surplus).
Answer Quick-Grid Key
Grading Reference Only
01: B 06: C 11: B 16: B 21: B
02: C 07: A 12: B 17: C 22: B
03: A 08: B 13: B 18: A 23: B
04: B 09: C 14: B 19: B 24: B
05: C 10: B 15: B 20: A 25: B
Economics Exam Teacher Keys • Form A Page 3 of 3
A [Answer]: State the market outcome for SUVs
C [Cite]: Reference the relationship between gasoline and SUVs
E [Explain]: Explain consumer incentives regarding the operational costs
Scenario 3
The Situation: An electronics manufacturer adopts artificial intelligence and advanced robotic assembly arms in their factories, allowing them to construct high-end smartphones in half the time.
Question: How does this technological shift affect the market equilibrium price and quantity of smartphones?
A [Answer]: State smartphone price and quantity directions
C [Cite]: Reference how robotic technology changes the supply curve
E [Explain]: Explain the mechanism of lower assembly costs on pricing and consumer quantity
Student ACE Checklist
Use this self-assessment grid to double-check each response before submitting your handout.
1. Answered?
My first sentence clearly answers the core economic prompt without fluff.
2. Cited Evidence?
My second sentence names a specific law, shift direction, or market detail.
3. Explained Why?
My third sentence explains how and why that citation drives real-world behavior.
Economics & Personal Finance ACE Practice Handout Page 2 of 2
Question: How does this change in gasoline pricing impact the demand for large, gas-guzzling SUVs?
A [Answer] Exemplar Response:
The overall demand for large, gas-guzzling SUVs will decrease significantly.
C [Cite] Exemplar Response:
This decline occurs because gasoline and SUVs are complementary goods, meaning a massive increase in the price of one reduces consumer demand for the other.
E [Explain] Exemplar Response:
Since SUVs require large quantities of fuel to operate, the high price of gasoline increases the lifetime cost of ownership, driving consumer preference away from SUVs toward hybrid or smaller vehicles, shifting the SUV demand curve left.
Scenario 3 Key
The Situation: Advanced robotic assembly arms allowing smartphone manufacturers to construct phones in half the time.
Question: How does this technological shift affect the market equilibrium price and quantity of smartphones?
A [Answer] Exemplar Response:
The equilibrium price of smartphones will fall, and the equilibrium quantity will rise.
C [Cite] Exemplar Response:
This shift occurs because advanced robotics is a technological advancement that reduces marginal production costs, shifting the smartphone market supply curve to the right.
E [Explain] Exemplar Response:
The increase in supply generates a temporary surplus at the old price point, forcing manufacturers to compete on price and lower costs to consumers, which increases total quantity demanded until a new equilibrium is reached.
Teacher Grading Tip
Students frequently struggle with the Explain (E) portion because they simply restate their Answer. Ensure that students include a behavioral mechanism (e.g., landlord supply disincentives, total cost of ownership calculations, or competitive pricing downward pressure) rather than just stating "therefore it goes down." Consider displaying the color-coded Florida freeze exemplar as a benchmark before students begin.
Economics & Personal Finance ACE Teacher Key Page 2 of 2
