[PENN STATE ECON102 MICROECONOMICS 2026] – EXAM-STYLE QUESTIONS
AND ANSWERS | VERIFIED AND WELL DETAILED ANSWERS | PLUS RATIONALES |
GUARANTEED PASS | 2026/27 LATEST UPDATE | EXAM PREP | STUDY GUIDE |
PRACTICE TEST
1. In a perfectly competitive market, if a firm is producing at an output level
where marginal revenue exceeds marginal cost, what should the firm do to
maximize profit?
A. Increase production
B. Decrease production
C. Maintain the current output level
D. Shut down operations immediately
Correct Answer: A. Increase production
Rationale: Profit maximization occurs where marginal revenue (MR) equals
marginal cost (MC). If MR > MC, the revenue gained from selling one more unit
exceeds the cost of producing it, so increasing output will increase total profit.
Decreasing production would reduce profit, maintaining output would forgo
additional profit, and shutting down is only appropriate if price falls below average
variable cost.
2. Which of the following is the best example of a positive externality?
A. A factory emitting air pollution that affects nearby residents
B. A neighbor's well-maintained garden that enhances the property values of
surrounding homes
,C. A restaurant playing loud music that disturbs the adjacent office building
D. A commuter driving alone during peak traffic hours
Correct Answer: B. A neighbor's well-maintained garden that enhances the
property values of surrounding homes
Rationale: A positive externality occurs when a third party benefits from an
economic transaction without paying for it. A well-maintained garden increases
property values for neighbors, providing an uncompensated benefit. Air pollution
and loud music are negative externalities, and driving alone during peak hours
creates traffic congestion, a negative externality.
3. When the price of a complementary good decreases, what is the most likely
effect on the demand for the related primary good?
A. Demand for the primary good decreases
B. Demand for the primary good remains unchanged
C. Demand for the primary good increases
D. The quantity demanded of the primary good decreases
Correct Answer: C. Demand for the primary good increases
Rationale: Complementary goods are used together. A decrease in the price of a
complement (e.g., printer ink) makes the combined use of both goods cheaper,
which increases the demand for the primary good (e.g., printers). This is a shift of
the entire demand curve, not a movement along the curve. Options A and D
describe opposite effects, while B incorrectly suggests no change.
,4. A price ceiling set below the equilibrium price in a market will most likely
result in:
A. A market surplus
B. A market shortage
C. An increase in total surplus
D. An efficient market outcome
Correct Answer: B. A market shortage
Rationale: A price ceiling below equilibrium makes the legal price lower than the
market-clearing price. At this lower price, the quantity demanded exceeds the
quantity supplied, creating a shortage. Surpluses result from price floors above
equilibrium. Total surplus decreases, not increases, and the outcome is inefficient
because mutually beneficial transactions do not occur.
5. A firm's total fixed costs are $1,000 per month. Its average variable cost is $5
per unit, and it produces 200 units per month. What is the firm's average total
cost at this output level?
A. $5.00
B. $7.50
C. $10.00
D. $15.00
Correct Answer: C. $10.00
Rationale: Average total cost (ATC) equals average fixed cost plus average variable
cost. Average fixed cost is total fixed cost divided by output: $1, = $5.00.
, Adding AVC of $5.00 gives ATC of $10.00. Option A is only the variable cost, B is an
incorrect calculation, and D would result from doubling fixed costs.
6. Which of the following characteristics is NOT associated with a perfectly
competitive market?
A. Identical products sold by all firms
B. Significant barriers to entry for new firms
C. Many buyers and sellers
D. Perfect information available to all market participants
Correct Answer: B. Significant barriers to entry for new firms
Rationale: Perfectly competitive markets are characterized by free entry and exit,
meaning there are no significant barriers to entry. Identical products, many buyers
and sellers, and perfect information are all hallmarks of perfect competition.
Significant barriers to entry are features of monopolies or oligopolies, making this
the incorrect characteristic for the question.
7. If a consumer's income increases and the consumer purchases more of a
particular good, that good is classified as:
A. An inferior good
B. A normal good
C. A substitute good
D. A complementary good
AND ANSWERS | VERIFIED AND WELL DETAILED ANSWERS | PLUS RATIONALES |
GUARANTEED PASS | 2026/27 LATEST UPDATE | EXAM PREP | STUDY GUIDE |
PRACTICE TEST
1. In a perfectly competitive market, if a firm is producing at an output level
where marginal revenue exceeds marginal cost, what should the firm do to
maximize profit?
A. Increase production
B. Decrease production
C. Maintain the current output level
D. Shut down operations immediately
Correct Answer: A. Increase production
Rationale: Profit maximization occurs where marginal revenue (MR) equals
marginal cost (MC). If MR > MC, the revenue gained from selling one more unit
exceeds the cost of producing it, so increasing output will increase total profit.
Decreasing production would reduce profit, maintaining output would forgo
additional profit, and shutting down is only appropriate if price falls below average
variable cost.
2. Which of the following is the best example of a positive externality?
A. A factory emitting air pollution that affects nearby residents
B. A neighbor's well-maintained garden that enhances the property values of
surrounding homes
,C. A restaurant playing loud music that disturbs the adjacent office building
D. A commuter driving alone during peak traffic hours
Correct Answer: B. A neighbor's well-maintained garden that enhances the
property values of surrounding homes
Rationale: A positive externality occurs when a third party benefits from an
economic transaction without paying for it. A well-maintained garden increases
property values for neighbors, providing an uncompensated benefit. Air pollution
and loud music are negative externalities, and driving alone during peak hours
creates traffic congestion, a negative externality.
3. When the price of a complementary good decreases, what is the most likely
effect on the demand for the related primary good?
A. Demand for the primary good decreases
B. Demand for the primary good remains unchanged
C. Demand for the primary good increases
D. The quantity demanded of the primary good decreases
Correct Answer: C. Demand for the primary good increases
Rationale: Complementary goods are used together. A decrease in the price of a
complement (e.g., printer ink) makes the combined use of both goods cheaper,
which increases the demand for the primary good (e.g., printers). This is a shift of
the entire demand curve, not a movement along the curve. Options A and D
describe opposite effects, while B incorrectly suggests no change.
,4. A price ceiling set below the equilibrium price in a market will most likely
result in:
A. A market surplus
B. A market shortage
C. An increase in total surplus
D. An efficient market outcome
Correct Answer: B. A market shortage
Rationale: A price ceiling below equilibrium makes the legal price lower than the
market-clearing price. At this lower price, the quantity demanded exceeds the
quantity supplied, creating a shortage. Surpluses result from price floors above
equilibrium. Total surplus decreases, not increases, and the outcome is inefficient
because mutually beneficial transactions do not occur.
5. A firm's total fixed costs are $1,000 per month. Its average variable cost is $5
per unit, and it produces 200 units per month. What is the firm's average total
cost at this output level?
A. $5.00
B. $7.50
C. $10.00
D. $15.00
Correct Answer: C. $10.00
Rationale: Average total cost (ATC) equals average fixed cost plus average variable
cost. Average fixed cost is total fixed cost divided by output: $1, = $5.00.
, Adding AVC of $5.00 gives ATC of $10.00. Option A is only the variable cost, B is an
incorrect calculation, and D would result from doubling fixed costs.
6. Which of the following characteristics is NOT associated with a perfectly
competitive market?
A. Identical products sold by all firms
B. Significant barriers to entry for new firms
C. Many buyers and sellers
D. Perfect information available to all market participants
Correct Answer: B. Significant barriers to entry for new firms
Rationale: Perfectly competitive markets are characterized by free entry and exit,
meaning there are no significant barriers to entry. Identical products, many buyers
and sellers, and perfect information are all hallmarks of perfect competition.
Significant barriers to entry are features of monopolies or oligopolies, making this
the incorrect characteristic for the question.
7. If a consumer's income increases and the consumer purchases more of a
particular good, that good is classified as:
A. An inferior good
B. A normal good
C. A substitute good
D. A complementary good
