AP Microeconomics Flashcards: Socially Efficient and Inefficient Market Outcomes
Written by AP Content Team, Verified for 2026 AP Exams, Last updated: May 2026
Review key ideas with interactive flashcards. This set includes 21 cards to help you master important concepts.
A firm with market power, such as a monopoly, produces where its private marginal benefit equals its private marginal cost. What is the consequence for the market?
This action leads to an equilibrium allocation that deviates from the efficient allocation, resulting in market inefficiency and deadweight loss.
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A firm with market power, such as a monopoly, produces where its private marginal benefit equals its private marginal cost. What is the consequence for the market?
This action leads to an equilibrium allocation that deviates from the efficient allocation, resulting in market inefficiency and deadweight loss.
What is social efficiency?
The optimal quantity of a good, occurring where the marginal benefit of consuming the last unit equals the marginal cost of producing that last unit, thus maximizing total economic surplus.
What determines the optimal quantity of a good?
The optimal quantity of a good occurs where the marginal benefit of consuming the last unit equals the marginal cost of producing that last unit.
What causes the market equilibrium quantity to differ from the socially optimal quantity?
This deviation occurs when social benefits and costs are not fully internalized by individuals, such as in cases of externalities or imperfect competition.
What is deadweight loss?
Deadweight loss is the loss of total economic surplus that results from the production of any non-efficient quantity.
How can private incentives lead to socially undesirable (inefficient) market outcomes?
Rational agents make optimal decisions by equating private marginal benefits and private marginal costs, which can differ from social benefits and costs, resulting in market inefficiencies.
Under what condition does the market equilibrium quantity equal the socially optimal quantity?
This occurs only when all social benefits and costs are internalized by individuals in the market.
Why is a market with a negative externality considered inefficient?
It is inefficient because rational agents equate their private costs and benefits, ignoring the external costs, which leads to overproduction relative to the socially efficient quantity where MSB=MSC.
What is the guaranteed outcome of producing any non-efficient quantity?
Producing any non-efficient quantity results in deadweight loss.
How is the deadweight loss resulting from a non-efficient quantity calculated on a graph?
Deadweight loss is calculated as the area of the triangle formed between the marginal social benefit and marginal social cost curves, from the inefficient quantity to the efficient quantity.
What tool do policymakers use to evaluate actions for reducing market inefficiencies?
Policymakers use cost-benefit analysis to evaluate different actions to reduce or eliminate market inefficiencies.
Besides imperfect competition, list three other situations that can lead to market inefficiencies.
Market inefficiencies can be caused by negative and positive externalities, asymmetric information, and insufficient production of public goods.
Why is resource allocation in perfectly competitive markets considered socially efficient?
In perfectly competitive markets, resource allocation is socially efficient because the market equilibrium quantity equals the socially optimal quantity, maximizing total economic surplus.
How do equilibrium allocations in imperfect markets (e.g., monopoly) compare to efficient allocations?
Equilibrium allocations in imperfect markets deviate from efficient allocations, leading to market inefficiency.
Why does a rational agent's decision to equate private marginal benefits and costs sometimes cause inefficiency?
This decision-making can result in market inefficiencies when private costs or benefits diverge from social costs or benefits.
Explain the difference between the decision-making rule for a rational agent and the condition for social efficiency.
A rational agent equates private marginal benefits and costs, while social efficiency requires that marginal social benefit equals marginal social cost.
List three market structures that can cause equilibrium allocations to be inefficient.
Inefficient allocations can be caused by market structures such as monopoly, oligopoly, and monopolistic competition.
What is market power?
Market power is a market characteristic that rational agents can pursue private actions to exploit or exercise, often leading to market inefficiencies.
What is total economic surplus?
Total economic surplus is the sum of consumer and producer surplus, which is maximized when the market produces the socially optimal quantity.
What economic measure is maximized when the socially optimal quantity is produced?
When the optimal quantity of a good is produced, total economic surplus is maximized.
What is the goal of policies designed to eliminate market inefficiencies?
These policies are designed to equate marginal social benefit with marginal social cost.