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Module 6 Quiz: Environmental and Public Economics

Test your understanding of the key concepts from Module 6. Each question has one correct answer. Click "Show Answer" to check your response.

1. A factory discharges effluent into a river, damaging fisheries downstream. The factory's owners and customers do not bear this cost. This is an example of:

  1. A positive externality
  2. A negative externality
  3. A public good
  4. A Pigouvian tax
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The correct answer is B. A negative externality is a cost imposed on third parties who are not part of the transaction. The factory and its customers benefit from cheap production, but the downstream fishing communities bear the pollution cost without compensation. The market price of the factory's product does not reflect this social cost, so the market overproduces relative to the socially optimal level.

Concept Tested: Negative Externality

2. India's pulse polio immunization campaign, which vaccinated hundreds of millions of children and achieved polio-free status in 2014, is an example of addressing which economic problem?

  1. The free rider problem in public goods
  2. Underproduction due to a positive externality
  3. The tragedy of the commons
  4. Moral hazard in healthcare
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The correct answer is B. Vaccination generates a positive externality: each vaccinated child protects not only themselves but everyone they might have infected (herd immunity). Because the social benefit exceeds the private benefit, the market alone would produce too few vaccinations. Government subsidy and provision push vaccination closer to the socially optimal level.

Concept Tested: Positive Externality

3. National defense is the classic example of a public good because it is:

  1. Expensive and requires government funding
  2. Non-rival and non-excludable
  3. Rival and excludable
  4. Provided by the private sector through competition
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The correct answer is B. A public good has two defining features: it is non-rival (one person's consumption does not reduce availability for others — defending one citizen does not reduce defense for another) and non-excludable (you cannot prevent any resident from benefiting). Cost (A) is not the defining feature — many expensive goods are private. The non-rival, non-excludable combination is what creates the free rider problem that makes private provision inadequate.

Concept Tested: Public Good

4. India is the world's largest user of groundwater, with over 30 million tube wells and minimal extraction regulation. Each farmer pumps as much as possible before neighbors drain the aquifer. This situation best illustrates:

  1. A positive externality
  2. The free rider problem
  3. The tragedy of the commons
  4. Cap-and-trade failure
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The correct answer is C. Groundwater is a common pool resource — rival (water pumped by one farmer is unavailable to others) but non-excludable (enforcement of extraction limits is nearly impossible with millions of users). Each farmer has an incentive to extract as much as possible, depleting the shared aquifer. This is the classic Tragedy of the Commons: individually rational behavior leads to collective resource destruction.

Concept Tested: Tragedy of the Commons

5. A Pigouvian tax on carbon emissions works by:

  1. Banning the use of fossil fuels above a certain threshold
  2. Giving firms free permits to pollute up to a set limit
  3. Making polluters pay the social cost of their emissions, so the market price reflects the true cost
  4. Subsidizing firms that use renewable energy
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The correct answer is C. A Pigouvian tax is set equal to the external cost per unit of the harmful activity. By forcing polluters to pay the social cost, the tax raises the market price of carbon-intensive goods, reducing demand and production to a level closer to the social optimum. It uses the price mechanism rather than fighting it — polluters choose how to reduce emissions (cleaner technology, less output, fuel switching), and the market finds the cheapest path. A ban (A) is command-and-control regulation. Free permits (B) describe cap-and-trade. Subsidies (D) are a different policy tool.

Concept Tested: Pigouvian Tax

6. Under a cap-and-trade system, which of the following is TRUE?

  1. The government sets the price of pollution and lets firms choose how much to pollute
  2. The government sets the total quantity of pollution and lets the market determine the price of permits
  3. Firms are free to pollute without limit as long as they purchase permits
  4. The system works only if all firms face the same cost of reducing pollution
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The correct answer is B. Under cap-and-trade, the government sets a cap on total emissions and issues permits up to that amount. Firms that can reduce emissions cheaply sell their excess permits to firms that find reduction more expensive. The permit price is determined by supply and demand in the permit market. This achieves the environmental target at the lowest possible total cost. Option A describes a tax (price-based) rather than cap-and-trade (quantity-based). Option C is wrong because the total quantity is capped. Option D is wrong — the system works precisely because firms have different abatement costs, allowing gains from trade.

Concept Tested: Cap-and-Trade

7. In Erin Brockovich, PG&E contaminated Hinkley's groundwater with hexavalent chromium for decades. Residents did not know their water was poisoned. This is an example of:

  1. The tragedy of the commons
  2. A Pigouvian tax failure
  3. Information asymmetry combined with a negative externality
  4. The free rider problem
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The correct answer is C. PG&E possessed information about the contamination that residents did not — a classic information asymmetry. The contamination itself was a negative externality: PG&E's industrial process imposed health costs on residents who were not party to the company's production decisions. The combination is especially harmful: the externality was invisible to those bearing the cost, which prevented them from taking protective action or demanding accountability.

Concept Tested: Externalities / Information Asymmetry (Film Connection)

8. Elinor Ostrom's research showed that the Tragedy of the Commons is NOT inevitable when communities:

  1. Privatize the resource and assign individual property rights
  2. Wait for government regulation to impose extraction limits
  3. Develop self-governing institutions with clear rules, monitoring, and graduated sanctions
  4. Abandon the shared resource and find alternatives
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The correct answer is C. Ostrom's central finding was that communities can successfully govern shared resources through self-organization — without privatization (A) or top-down government regulation (B). Her eight design principles — including clear boundaries, locally adapted rules, collective choice, monitoring by users, and graduated sanctions — describe the institutional features that distinguish successful commons from failed ones. Abandoning the resource (D) is not governance; it is retreat.

Concept Tested: Commons Governance / Ostrom's Design Principles (Nobel Connection)

9. Uttarakhand's Van Panchayats — community-managed forest councils dating back to the 1930s — are considered a real-world validation of Ostrom's theory because they:

  1. Were imposed by the British colonial government as a top-down regulation
  2. Privatized forest land by giving individual villagers ownership of specific plots
  3. Feature community-made rules, local monitoring, and graduated penalties — matching Ostrom's design principles
  4. Rely on the state forest department for all enforcement
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The correct answer is C. Van Panchayats are community-governed institutions where village councils set harvesting rules, community members monitor compliance, and violators face graduated penalties — closely matching Ostrom's eight design principles. While formalized under British-era Van Panchayat Rules of 1931, they are rooted in older community practices. Research by Agrawal and Ostrom (2001) found that these community-managed forests often achieved better ecological outcomes than either state-managed forests or open-access areas.

Concept Tested: Ostrom's Design Principles / Indian Application

10. Climate change is described as "the largest collective action problem humanity has ever faced." This is because:

  1. Climate science is uncertain and economists cannot model the problem
  2. Carbon emissions are a global negative externality, the atmosphere is a commons, and each nation has an incentive to free ride on others' mitigation efforts
  3. Climate change only affects developing countries, so wealthy nations have no incentive to act
  4. The technology to address climate change does not yet exist
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The correct answer is B. Climate change combines every market failure concept in this module. Carbon emissions are a negative externality at global scale — each emitter imposes costs on the entire planet. The atmosphere is a global common pool resource. Climate stability is a public good — non-rival and non-excludable. And each nation faces a free rider incentive: the cost of reducing emissions is borne domestically, while the benefit is shared globally. This creates a collective action problem of unprecedented scale and complexity.

Concept Tested: Collective Action / Externalities / Public Goods / Sustainability

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