Environmental Protection and Negative Externalities — Study Notes (Ch. 12)

12.1 The Economics of Pollution

  • Chapter focus and objectives:

    • The Economics of Pollution

    • Command-and-Control Regulation

    • Market-Oriented Environmental Tools

    • The Benefits and Costs of U.S. Environmental Laws

    • International Environmental Issues

    • The tradeoff between economic output and environmental protection

  • Keystone XL context as an example of environmental regulation and its economic tradeoffs:

    • Pipeline to transport oil from Canada to U.S. Gulf refineries; private ownership (TransCanada) with government approval due to size/location

    • Potential economic benefits: higher oil production, lower price pressure at the gas pump, boosted economic growth; supporters argued for safety and reduced dependence on Middle Eastern oil

    • Critics’ concerns: construction over a massive aquifer in the Midwest, environmentally fragile Nebraska, risk of water contamination and harm to ecosystems; possibility of leaks and disruption to indigenous species

    • Policy outcome: Obama (2015) refused cross-border permit; Trump (2017) sought permit amid legal challenges; Biden (2021) canceled the permit, effectively ending the project (for now)

  • Why environmental concerns matter for economic policy:

    • How to value environmental damage when monetary prices are not easily assigned to environmental goods

    • The central question: do pipeline benefits outweigh opportunity costs when environmental damages are considered?

  • Historical context of pollution and externalities:

    • 1969: Cuyahoga River in Ohio caught fire due to heavy pollution

    • Chattanooga anecdote describing extreme air pollution and health effects

    • Pollution problems are universal across income levels and economic systems

  • How economists frame the issue: social costs vs private costs

    • Traditional approach: government limits on emissions (command-and-control)

    • Economists’ extension: flexible, market-oriented policies can reduce pollution at lower costs while achieving similar outcomes

  • Key definitions:

    • Externality: a spillover effect of a market transaction on a third party not involved in the transaction

    • Negative externality: e.g., pollution imposing costs on society

    • Positive externality: e.g., a market activity that confers benefits to others not captured in the price

    • Market failure: when markets do not account for all social costs or benefits, leading to inefficient outcomes

  • Decades of growth versus pollution control (1970–2020):

    • Population up by ~63%

    • Economy up by >3.8×

    • Despite growth, progress against pollutants has occurred via anti-pollution policies

  • Evidence of progress: Table 12.1 – CO2 emissions by energy source, energy consumption, and totals (source: EIA Monthly Energy Review)

    • 1973: Coal = 1,221; Natural Gas = 1,175; Petroleum = 2,325; Total = 4,721 (million metric tons)

    • 2007: Coal = 2,171; Natural Gas = 1,245; Petroleum = 2,587; Total = 6,016

    • 2020: Coal = 875; Natural Gas = 1,648; Petroleum = 2,042; Total = 4,576

  • Trend note:

    • Between 2007 and 2012, emissions declined by 740 MMT/year, a 12% reduction, signaling progress in reducing emissions even with ongoing energy use

  • Externalities in market transactions: an illustration with a concert venue near a neighborhood

    • Buyers/sellers of tickets benefit, but neighbors may experience negative spillovers (noise, pollution)

    • Externalities can be negative or positive (e.g., free concerts nearby could be a positive externality for some)

  • Social vs private costs in production (example: refrigerators)

    • Private supply curve S_private reflects only private production costs

    • Social costs include external costs from pollution (e.g., health, environment)

    • Without external costs, market equilibrium E0 is at price $650 and quantity 45,000

    • If external costs are $100 per unit, supply shifts up to S_social, creating a new equilibrium E1 at price $700 and quantity 40,000

    • Result: higher price, lower output, and lower pollution

  • Table 12.2 (illustrating the supply shift due to pollution costs):

    • Price | Quantity Demanded | Quantity Supplied before (private costs) | Quantity Supplied after (social costs)

    • $600 | 50,000 | 40,000 | 30,000

    • $650 | 45,000 | 45,000 | 35,000

    • $700 | 40,000 | 50,000 | 40,000

    • $750 | 35,000 | 55,000 | 45,000

    • $800 | 30,000 | 60,000 | 50,000

    • $850 | 25,000 | 65,000 | 55,000

    • $900 | 20,000 | 70,000 | 60,000

  • Work It Out 12.1 – Trumpet-playing firm (illustrates external costs and equilibrium shifts):

    • Table 12.3: Supply and demand for a trumpet-playing firm

    • No externality (private costs):

    • Equilibrium at price $10, quantity 5 (Q = 5)

    • Corresponding private-supply quantity equals demand at this point

    • With external costs:

    • Equilibrium shifts to price $12, quantity 4

    • Step-by-step method summary:

    • Step 1: Identify the negative externality (e.g., increased noise)

    • Step 2: Determine initial equilibrium with private costs

    • Step 3: Find row where Quantity Demanded equals Quantity Supplied without external costs; read price (private equilibrium)

    • Step 4: Find row where Quantity Demanded equals Quantity Supplied after external costs; read price (social equilibrium)

    • Step 5: Compare the two equilibria to see the impact on price, quantity, and welfare

  • Key theoretical takeaway:

    • When externalities exist, the private market does not account for all social costs, leading to overproduction (pollution) relative to the social optimum

    • If firms pay the social costs, production decreases and prices rise, reducing pollution but also reducing output

  • Next module preview (transition):

    • Move from a purely command-and-control approach to market-oriented tools to address social costs of pollution more efficiently

12.2 Command-and-Control Regulation

  • Definition:

    • Government regulation that specifies allowable emission quantities or mandates specific pollution-control technologies

  • Historical context:

    • Late 1960s and early 1970s: widespread adoption of comprehensive environmental laws

    • 1970: Establishment of the Environmental Protection Agency (EPA)

    • 1970: Clean Air Act enacted

    • 1972: Clean Water Act enacted

  • How it works:

    • Sets hard limits on emissions for pollutants (quantity limits)

    • May require installation of particular control technologies

  • Accomplishments:

    • Historically, contributed to cleaner air and water in the United States

  • Criticisms (three main difficulties):

    • No incentive to improve beyond the standard once met (no continuous improvement incentive)

    • Inflexible: same standard for all polluters; may not account for differing abatement costs across firms

    • Politically negotiated; can include loopholes, exemptions, and fine print that dilute effectiveness

  • Overall assessment:

    • While effective in many respects, economists favor market-oriented tools that provide incentives and flexibility for achieving pollution reductions at lower cost

12.3 Market-Oriented Environmental Tools

  • Overview:

    • Market-oriented policies provide incentives for firms to reduce pollution with some flexibility in how reductions are achieved

  • Core categories:

    • Pollution charges

    • Marketable permits

    • Better-defined property rights

  • Pollution charges (Pigovian taxes):

    • Definition: a tax on the quantity of pollution emitted

    • Economic logic: firms abate if the marginal cost of abatement (MC_abate) is less than the tax per unit of pollution

    • Example marginal abatement costs (per 10 pounds of particulates):

    • 1st 10 lb: $300

    • 2nd 10 lb: $500

    • 3rd 10 lb: $900

    • 4th 10 lb: $1,500

    • 5th 10 lb: $2,500

    • With a pollution tax of $1,000 per 10 pounds, optimal abatement is 30 pounds because:

    • MC_abatement(30) = $900 < $1,000

    • MC_abatement(40) = $1,500 > $1,000

    • Implications:

    • Firms with low abatement costs reduce more; those with high costs may simply pay the tax

    • Tax applies broadly (no loopholes for favored producers) and can incentivize cost-effective technology adoption

    • Household example: pay-as-you-throw for garbage collection; gas taxes as a pollution-related charge; bottle bills as a form of pollution charge with recycling incentives

    • Comparative advantage: pollution charges often more flexible and cost-effective than command-and-control in many contexts

    • Link: bottle bill status and cross-country adoption can be explored on OpenStax resource

  • Marketable permits (cap-and-trade):

    • Process:

    • Government sets total allowable emissions and allocates permits to firms (may be free or auctioned)

    • Firms can trade permits; permits may shrink over time to reduce total emissions

    • Example (Table 12.4): four firms with initial emissions and permits

    • Gamma reduces from 600 to 200; has unused permits for 100 tons

    • Alpha reduces from 200 to 150; buys permits from Gamma instead of reducing to 100

    • Beta reduces from 400 to 200; no permits to sell

    • Delta initially has 0; must buy permits for 50 tons to start

    • Result: total pollution declines; market determines which firms reduce most based on cost

    • Real-world application: 1990 Clean Air Act amendments aimed to cut sulfur dioxide emissions by half of 1980 levels using permits that were initially allocated free to coal-fired electricity generators; permits were shrinkable over time

  • Better-defined property rights:

    • Coase theorem (Ronald Coase): clear definition of property rights determines who bears the cost of reducing externalities and who pays to implement the least-cost solution

    • Classic example: railroads adjacent to a farmer’s field and the sparks from locomotives; who should prevent field fires?

    • If the farmer has a right to a fire-free field or the railroad has a right to operate without restriction, negotiations will lead to the cheapest resolution

    • Endangered species on private land: most endangered species live on private property; defining property rights can influence incentive structures for habitat protection

    • Policy implication: well-defined property rights can encourage private actors to invest in ecological preservation (e.g., habitat provision by landowners in exchange for compensation)

  • Matching policy tools to situations:

    • Marketable permits work best when a relatively small number of stakeholders trade (e.g., refineries trading lead permits or utilities trading SO2 permits)

    • For millions of small emitters with little trading interest (e.g., car engine emissions or cans recycling), pollution charges may be more effective

    • Hybrid approaches: combine marketable permits with pollution taxes or use improved property rights to achieve desired reductions

12.4 The Benefits and Costs of U.S. Environmental Laws

  • Economic burden and scale:

    • Government economists estimate U.S. firms pay more than $200 billion per year to comply with federal environmental laws

  • Benefits of cleaner environment (four broad categories):

    • Health improvements: people stay healthier and live longer

    • Economic sectors relying on clean environment: farming, fishing, tourism benefit

    • Property values: may be higher due to cleaner air/water

    • Non-market enjoyment: people value a clean environment even without market transactions (aesthetic and intrinsic value)

  • Quantitative estimates of benefits vs costs (EPA findings):

    • 1970–1990 Clean Air Act costs: approximately $500 billion; benefits: around $22 trillion (health, environmental improvements) – a 44:1 benefit-to-cost ratio

    • A more recent EPA estimate (as of 2010) suggested benefits of Clean Air Act programs around $110 billion annually, largely from avoided illness and premature death

    • Note: Benefits vary by pollutant; for some pollutants, benefits exceed costs; for others, costs may be comparable to or exceed benefits

  • Ecotourism and biodiversity as economic considerations:

    • Ecotourism definition and market potential: interest in nature/wildlife tourism; International Ecotourism Society projected 1.56 billion trips by 2020 (COVID-19 impacted this target in 2020)

    • Examples of ecotourism benefits in low-income countries: South Africa, Namibia, Zimbabwe (habitat protection linked to local incomes); Costa Rica, Panama; Caribbean, Malaysia, New Zealand, Serengeti, Amazon, Galapagos

    • Government policies to share ecotourism revenues with local communities can provide property rights-like incentives for habitat protection

    • Potential risks: unmanaged ecotourism can stress wildlife and cause behavioral changes; well-managed ecotourism is generally net positive

  • Marginal analysis of environmental protection (MB vs MC):

    • Theoretical model (Figure 12.4): MB (marginal benefit of pollution reduction) declines as more pollution is reduced; MC (marginal cost of pollution reduction) increases with greater reductions

    • Early stages: many cheap reductions yield high MB; later stages: reductions are more costly and benefits per unit fall

    • Social optimum occurs where MB = MC; beyond the optimum, further reductions become costlier than the benefits they generate

    • Policy implication: to minimize costs while achieving desired environmental outcomes, market-oriented tools can help target reductions where they are most cost-effective

  • How EPA values lives and health impacts (CLEAR IT UP):

    • Value of a statistical life (VSL) used in regulatory cost-benefit analyses

    • NCEE (National Center for Environmental Economics) values a statistical life at $7.4 million (2006 dollars), approximately $10.5 million in February 2022 dollars

    • Regulatory decision rule: agencies may approve rules where the cost per life saved is below a threshold (e.g., U.S. Department of Transportation often uses a threshold of around $3 million per life saved)

    • Important nuance: VSL estimates vary; studies (e.g., Kip Viscusi) suggest extremely high cost-per-life-saved thresholds (e.g., $50 million per life) could imply lives are diverted rather than saved when costs are too high

    • Takeaway: life-value estimates are central to determining whether a regulation is “reasonable” from a policy perspective, but there is uncertainty and debate about the appropriate valuation

  • References to further readings and sources in the EPA and OpenStax materials:

    • EPA environmental valuation studies and mortality risk valuation documentation

    • World Tourism Organization and ecotourism references for broader context on environmental economics and policy