--- title: "AP Microeconomics Unit 6 Practice Test" description: "A timed AP Microeconomics Unit 6 (Market Failure and the Role of Government) practice test in the AP format, drawn from 1,057 multiple-choice questions and 38 FRQs written for the unit. The standard version takes about 63 minutes." canonical: "https://fiveable.me/ap-micro/unit-test/6" type: "unit-test" subject: "AP Microeconomics" unit: "Unit 6" --- # AP Microeconomics Unit 6 Practice Test ## Overview A timed AP Microeconomics Unit 6 (Market Failure and the Role of Government) practice test in the AP format, drawn from 1,057 multiple-choice questions and 38 FRQs written for the unit. The standard version takes about 63 minutes. ## Test Format - 20 Multiple Choice Questions (23 minutes) - 1 FRQ – FRQ 1 – Long (20 minutes) - 1 FRQ – FRQ 2 – Short (20 minutes) ## Unit FRQs by Type - [FRQ 1 – Long](/ap-micro/frqs/long-frq?unit=6): 4 questions - [FRQ 2 – Short](/ap-micro/frqs/short-frq-2?unit=6): 15 questions - [FRQ 3 – Short](/ap-micro/frqs/short-frq-3?unit=6): 19 questions ## Practice Questions ### Question 1 A fishing ground is a common resource with open access. Two changes occur simultaneously: the global demand for fish rises, and fishing technology becomes more efficient. Without regulation, what is the combined effect on the resource's scarcity? - (A) The depletion of the fish stock accelerates due to increased incentives and ability to harvest - (B) The fish stock declines, but more slowly because higher prices create incentives for some fishing communities to voluntarily limit their catch - (C) The fish stock remains relatively stable because increased demand is offset by the reduced fishing effort from higher operating costs associated with efficient technology - (D) The depletion of the fish stock accelerates, but only because global demand increases while efficient technology has no additional effect on harvest rates - (E) The fish stock remains stable because efficient technology reduces the cost per unit harvested, offsetting demand increases **Answer: (A)** Combining the variables reveals a reinforced negative outcome. Higher demand raises prices (increasing the incentive to fish), while better technology lowers costs (increasing the ability to fish). Both factors lead to faster over-extraction. ### Question 2 Why does a pure market economy typically fail to produce the efficient quantity of national defense? - (A) Firms underproduce because they cannot exclude non-payers from benefits - (B) Firms underproduce because they cannot capture all consumer surplus from the service - (C) Firms underproduce because they lack information about consumer demand for national defense - (D) Firms underproduce because they cannot prevent free-riding on their production efforts - (E) Firms underproduce because consumers lack information about national defense benefits **Answer: (A)** National defense is a public good: once it is provided, no one can be excluded from its protection, so people have no incentive to pay voluntarily. This non-excludability causes firms to underproduce because they cannot capture revenue from everyone who benefits. ### Question 3 A paper mill in a mixed economy produces a chemical byproduct that pollutes a nearby river. Which government action would best correct this resource allocation issue to achieve efficiency? - (A) Subsidize the mill's production to lower consumer prices - (B) Tax the mill's pollution to internalize the social costs - (C) Set price ceilings on paper to ensure consumer affordability - (D) Nationalize the mill to maximize production output targets - (E) Regulate the mill's production output to reduce total pollution **Answer: (B)** Applying the solution for negative externalities explains how to restore efficiency. A tax equal to the marginal external cost forces the firm to account for the pollution, aligning private cost with social cost. ### Question 4 A society operates under a mixed economic system where national defense is funded through taxation. If the government stops providing national defense and relies solely on voluntary market transactions, what will be the result? - (A) National defense will be underproduced due to the free-rider problem with non-excludable goods. - (B) National defense will be overproduced as firms seek to maximize profit from security services. - (C) National defense will be produced optimally as consumer demand accurately reflects true value. - (D) National defense will be produced efficiently as competition among private firms lowers costs. - (E) National defense will be optimally produced as private firms compete to provide the best security services. **Answer: (A)** Recognizing the characteristics of public goods reveals that private markets fail to produce them efficiently because individuals can benefit without paying. ### Question 5 A country replaces a progressive income tax system with a lump-sum tax on all citizens to fund public services. Based on economic principles, how will this change influence efficiency and equity? - (A) Efficiency increases due to fewer distortions, but income inequality likely increases. - (B) Efficiency decreases due to lower work incentives, but income inequality likely decreases. - (C) Efficiency increases due to higher revenue, and income inequality likely decreases. - (D) Efficiency decreases due to reduced consumption, and income inequality likely increases. **Answer: (A)** Applying tax theory reveals that lump-sum taxes do not distort marginal decision-making (increasing efficiency) but take a higher percentage of income from the poor (decreasing equity). ### Question 6 In an unregulated market economy, a chemical plant releases waste into a nearby river, damaging local fisheries. What is the outcome regarding the allocation of resources to chemical production? - (A) Chemicals are overproduced because the firm does not pay the full social cost of production. - (B) Chemicals are underproduced because the firm faces higher costs due to environmental damage. - (C) Chemicals are produced optimally because the market price reflects all costs of production. - (D) Chemicals are overproduced because the government subsidizes industries that create jobs. **Answer: (A)** Using the model of externalities, when negative external costs are ignored by the market, the marginal private cost is lower than the social cost, leading to overproduction. ### Question 7 Private opportunity cost and social opportunity cost both measure foregone alternatives, but they differ when externalities are present. Which statement best describes this difference? - (A) Social cost includes both private costs and external costs borne by third parties. - (B) Private cost includes both social costs and external costs borne by third parties. - (C) Social cost includes only external costs and excludes private costs to the firm. - (D) Private cost includes only external costs and excludes social costs to the firm. **Answer: (A)** Describing the difference requires aggregating costs. Social opportunity cost accounts for the full resource use of society, which includes the private costs to the decision-maker plus any costs imposed on others (externalities). ### Question 8 A factory produces chemicals where the private marginal cost is $20 and the external cost is $10 per unit. If the marginal benefit to consumers is $25, what is the efficient outcome? - (A) Produce the unit, because the marginal benefit exceeds the private cost - (B) Produce the unit, because the external cost is less than the private cost - (C) Do not produce, because the social cost exceeds the marginal benefit - (D) Do not produce, because the external cost exceeds the marginal benefit - (E) Produce the unit, because the marginal benefit exceeds the external cost **Answer: (C)** Calculating marginal social cost ($20 private + $10 external = $30) shows it exceeds marginal benefit ($25), making production inefficient. ### Question 9 A limitation of using the sum of consumer and producer surplus to measure total social welfare is that this calculation assumes: - (A) No external costs or benefits exist, meaning private costs and benefits reflect all social costs and benefits. - (B) Perfect information exists in all markets, meaning private costs and benefits reflect all social costs and benefits. - (C) All firms operate in perfectly competitive markets, meaning private costs and benefits reflect all social costs and benefits. - (D) All consumers have identical preferences and income levels, meaning private costs and benefits reflect all social costs and benefits. - (E) All consumers have identical preferences, meaning private costs and benefits reflect all social costs and benefits. **Answer: (A)** Identifying model limitations requires understanding assumptions. The standard surplus calculation assumes the market demand and supply curves capture all social values; if externalities exist, the private surplus calculation fails to reflect true social welfare. ### Question 10 Which of the following conditions defines a socially efficient allocation of resources in a market? - (A) Marginal social benefit equals marginal social cost - (B) Marginal private benefit equals marginal private cost - (C) Total social benefit is maximized regardless of cost - (D) Total social cost is minimized regardless of benefit - (E) Consumer surplus is maximized in the market **Answer: (A)** Social efficiency occurs when resources are allocated such that the additional benefit to society of the last unit produced equals the additional cost to society. ## Review the Unit - [6.1 Socially Efficient and Inefficient Market Outcomes](/ap-micro/unit-6/socially-efficient-inefficient-market-outcomes/study-guide/IGKVqbWp7w3ou8LWln6K) - [6.2 Externalities](/ap-micro/unit-6/externalities/study-guide/3VFIWL8amdvgKMzyscs9) - [6.3 Public and Private Goods](/ap-micro/unit-6/public-private-goods/study-guide/xtKo6h0j7cwx3o7wq3R7) - [6.4 The Effects of Government Intervention in Different Market Structures](/ap-micro/unit-6/effects-government-intervention-different-market-structures/study-guide/Vo9KNzD2qK0rP6aGQkhe) - [6.5 Inequality](/ap-micro/unit-6/inequality/study-guide/rmL71WEQFiM4gxDOnFca) ## Other Unit Tests - [Unit 1: Basic Economic Concepts](/ap-micro/unit-test/1) - [Unit 2: Supply and Demand](/ap-micro/unit-test/2) - [Unit 3: Production, Cost, and the Perfect Competition Model](/ap-micro/unit-test/3) - [Unit 4: Imperfect Competition](/ap-micro/unit-test/4) - [Unit 5: Factor Markets](/ap-micro/unit-test/5) ## About This Document Canonical Fiveable pages are available as Markdown at the same path plus `.md`. - [llms.txt](https://fiveable.me/llms.txt): index of Fiveable's sections and URL patterns - [llms-full.txt](https://fiveable.me/llms-full.txt): complete subject and unit listing - [MCP server](https://fiveable.me/mcp): call Fiveable as tools instead of fetching pages (`https://fiveable.me/api/mcp`) - [MCP server for AP teachers](https://fiveable.me/mcp/teachers): a teacher's classes, assignments and AP-rubric grading (`https://fiveable.me/api/mcp/teacher`)