1 Externalities and the Environment CHAPTER 17 © 2003 South-Western/Thomson Learning

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Externalities and the Environment

CHAPTER

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© 2003 South-Western/Thomson Learning

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IntroductionMust begin by distinguishing between exhaustible and renewable resources

Exhaustible resource does not renew itself available in a finite amount

Coal, oil, etc

A resource is renewable if, when used conservatively, it can be drawn on indefinitely

Trees, fish, atmosphere, water

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Renewable Resources

Some renewable resources are open-access goods

Open-access resource is rival in consumption but exclusion is costly

For example, fish caught in the ocean are not available for others to catch rival in consumption

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Renewable Resources

However, it would be difficult for a person or firm to “own” fish still in the ocean and prevent others from catching them exclusion is costly

An open-access good is often subject to the common-pool problem results because people consume a good until the marginal value of additional use drops to zero they are often overused

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Renewable ResourcesIn a market system, specific individuals usually own the rights to resources and therefore have a strong interest in using those resources efficiently

Private property rights allow individuals to use resources or to charge others for their use

Defined and enforced by government, by social actions, and by ethical normsFor open-access resources, specifying and enforcing property rights is costly

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Renewable Resources

Pollution and other negative externalities arise because there are no practical, enforceable, private property rights to open-access resources, such as air and water

Market prices usually fail to include the costs that negative externalities impose on society

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Resolving the Common-Pool Problem

By imposing restrictions on resource use, government regulations may be able to reduce common-pool problems

Output restrictions or taxes could force firms to use the resources at a rate that is socially optimal

More generally, when imposing and enforcing property rights would be too costly, government regulations may improve allocative efficiency

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Resolving the Common-Pool Problem

Not all regulations are equally efficient

For example, the specific regulation may lead each firm to act rationally, but the collective effect of the regulation and their actions is grossly inefficient in terms of social welfare

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Negative Externalities: Fixed Technology

How could output be restricted to the socially efficient level?

If government policy makers knew the demand and marginal cost curves, they could simply restrict electric utilities to produce that optimal level

Alternatively, they could impose a pollution tax on each unit of output equal to the marginal external cost

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Negative Externalities: Fixed Technology

In the case of the pollution tax, the marginal private cost curve would shift upward to the marginal cost curve private costs are brought in line with public costs

Thus, setting the tax equal to the marginal external cost results in a level of output that is socially efficient the marginal social cost of production equals the marginal benefit

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Negative Externalities: Variable Technology

The preceding example assumes that the only way to reduce the total amount of pollution is to reduce outputHowever, power companies can usually change their resource mix to reduce emissions for a given level of output, particularly in the long runBecause pollution can be reduced by altering the production process rather than by simply adjusting the rate of output, these externalities are said to be produced under conditions of variable technology

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Negative Externalities: Variable Technology

Thus, the idea that all air pollution should be eliminated is a popular misconception

Some pollution is consistent with efficiency improving air quality benefits society as a whole as long as the marginal benefit of cleaner air exceeds its marginal cost

What would happen to the optimal level of air quality if either the marginal cost or the marginal benefit changed

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The Coase Theorem

The traditional analysis of externalities assumes that market failures arise because people ignore the external effects of their actions

Consider the following exampleA research laboratory that tests delicate equipment locates next to a manufacturer of heavy machineryThe vibrations caused by the manufacturing process throw off the delicate machinery in the lab

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The Coase Theorem

Coase pointed out that the negative externality in this case is not necessarily imposed by the machinery producer on the testing lab

Rather, it arises from the incompatible activities of the two parties the externality is the result both of vibrations created by the factory and of the location of the testing lab next door

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The Coase Theorem

There are two efficient solutions in this situation

Modify the machines in the factory, orMove the lab elsewhere

According to Coase, the efficient solution depends on which party can avoid the problem at the lower cost

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The Coase TheoremSuppose the following

The factory determines that it would cost $2 million to reduce vibrations enough to allow the lab to function normallyThe testing lab concludes that it cannot alter its equipment to reduce the effects of the vibrations its only recourse is to move at a cost of $1 million

Thus, the least-cost, or most efficient resolution to the externality problem is for the testing lab to relocate

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The Coase Theorem

Coase argued that when property rights are assigned to one party or another, the two parties will agree on the efficient solution to an externality problem as long as the transaction costs are low the efficient solution will be achieved regardless of which party gets the property rights

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The Coase TheoremSuppose the testing lab is granted the right to operate free of vibrations it has the right to ask the factory to reduce its vibrationsRather than cut vibrations at a cost of $2 million, the factory can offer to pay the lab to relocateAny payment by the factory owners that is greater than $1 million but less than $2 million will make both better off the lab will move, which is the efficient outcome

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The Coase Theorem

Alternatively, suppose the factory is granted the right to generate vibrations regardless of any effects on the testing lab business as usual

The lab may consider paying the factory to alter its production method, but since the minimum payment the factory would accept is $2 million, the lab would rather move at a cost of $1 million

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The Coase Theorem

Thus, whether property rights are granted to the lab or to the factory, the lab will move which is the most efficient solution

NoteRegardless of who is given the property rights, an efficient outcome resultsA particular assignment of property rights determines only who incurs the externality cost not the efficient outcome

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Markets for Pollution RightsThe primary implication of the Coase Theorem is that assignment of property rights is often sufficient to resolve the market failure associated with externalities no further government intervention is necessary

If pollution can be easily monitored and polluters easily identified, the government may be able to achieve an efficient solution to the problem of pollution simply by assigning the right to pollute

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Markets for Pollution RightsConsider the following example:

Firms that dump waste into a river evidently value the ability to discharge waste in this fashion provides an inexpensive outlet for pollutants that would have to be disposed of at a greater costThe river provides disposal services, and the demand curve for this pollutant the demand curve slopes downward

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Markets for Pollution RightsThe beauty of this system is that producers who value the discharge rights the most will ultimately end up with them

Producers who attach a lower marginal value obviously have cheaper ways of resolving their waste problems

And if conservation groups want a higher quality than the government’s standard, such as waste clean enough to drink, they can purchase the pollution permits

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Markets for Pollution Rights

If the right to pollute could be granted, monitored, and enforced, then what had been a negative externality problem could be solved through market allocation

In 1989, a pollution-rights market for fluorocarbon emissions was established and was followed in 1990 by a market for sulfur dioxide and during the 1990s sulfur-dioxide emissions fell by more than half

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Unfortunately, legislation dealing with pollution is affected by the same problems of representative democracy that trouble other public policy questions

Polluters have a special interest in government proposals relating to pollution they fight measures to reduce pollution

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Markets for Pollution RightsHowever, members of the public remain rationally ignorant about pollution legislation

So pollution regulations may be less in accord with the public interest than with the special interests of polluters

This is why a portion of pollution permits are often given free to existing firms

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Markets for Pollution RightsPrior to 1990, traditional command-and-control environmental regulations were the norm

This approach required polluters to introduce particular technologies to reduce emissions by specific amounts

These regulations were based on engineering standards and did not recognize unique circumstances across generating plants

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Economic efficiency approach

Reflected by the pollution rights approach

Offers each polluter the flexibility to reduce emissions in the most cost-effective manner given its unique costs

Firms with the lowest emission control costs have an incentive to implement the largest reduction in emissions, and then sell unused allowances to those with greater control costs

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Environmental Protection

Environmental Protection Agency, EPA, coordinates federal efforts to address common-pool problemsFour federal laws and subsequent amendments underpin U.S. efforts

The Clean Air Act of 1970The Clean Water Act of 1972The Resource Conservation and Recovery Act of 1976 which governs solid waste disposalThe Superfund law of 1980 focusing on toxic waste dumps

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Environmental Protection

Compliance with pollution-control regulations costs U.S. producers and consumers an amount equivalent to 2% of gross domestic productPollution-abatement spending can be divided into three categories

Spending for air-pollution abatement: 40% toward cleaner airSpending for water-pollution abatement: 40% toward cleaner waterSpending for solid waste disposal: 20%

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Air Pollution

In the Clean Air Act of 1970, Congress set national standards for the amount of pollution that could be emitted into the atmosphere recognized the atmosphere as an economic resource with alternative usesSmog is the most visible form of air pollution

Automobile emissions account for 40% of smog40% from consumer products15% from manufacturing

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Air PollutionDespite recent improvements in air quality, the United States is still a major source of carbon dioxide emissionsKyoto accord would require the 38 industrial countries to reduce emissions by one-third over ten years cost to U.S. of $300 billion a year Problem is that this accord requires nothing from developing countries like China and India which are major polluters

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Water PollutionTwo major sources of water pollution

Sewage• For decades, U.S. cities had an economic

incentive to dump their sewage directly into waterways

• Federal money over the years has funded sewage treatment plants that have cut water pollution substantially nearly all cities now have modern sewage control systems

• New York City is the exception and still dumps raw sewage into the Atlantic Ocean

Chemicals• 10% comes from point pollution pollution from

factories and other industrial sites• Two-thirds comes from nonpoint pollution

runoff from agricultural pesticides and fertilizers

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Water PollutionThe EPA has turned pesticide regulation over to the states which gave the job to their departments of agriculture

However, these state agencies usually promote the interests of farmers, not restrict what they can do

The EPA now reports that pesticide residues on food pose more health problems than do toxic waste dumps or air pollution

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Hazardous Waste and the Superfund

The chemicals posed by the synthetic chemical industry occur at every stage in their production, use, and disposal

New Jersey manufactures more toxic chemicals than any other state and has the worst toxic waste burden

Prior to 1980, once a company paid someone to haul away its hazardous waste, the company was no longer responsible

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The Comprehensive Environmental Response, Compensation, and Liability Act of 1980 – Superfund law – now requires any company that generates, stores, or transports hazardous wastes to clean up any wastes that are improperly disposed of

Gives the federal government authority over sites contaminated with toxins

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To get an offending company to comply, the EPA frequently must sue

This process is slow, and nearly half the budget goes to lawyers, consultants and administrators rather than to site cleanups

The law did not require that benefits exceed costs or even that such comparisons be attempted

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Although billions have been spent so far, an EPA study concluded that the health hazards of Superfund sites have been vastly exaggerated

Because of their greater political urgency and media appeal, toxic waste dumps tend to receive more attention and air or water pollution

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Solid Waste: Paper or Plastic

About 70% of the nation’s garbage is bulldozed and covered with soil in landfills

As the cost of solid-waste disposal increases, state and local governments are charging for trash pickups and requiring recycling the process of converting waste products into reusable material

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Still, according to the EPA, only about 15% of U.S. garbage gets recycled, about 15% is incinerated, and the remaining 70% goes into landfills

Of the recycled material, three quarters consists of paper related materials

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Some recycling is clearly economical, but recycling imposes its own cost on the environment

Curbside recycling requires fleets of trucks that pollute the airNewsprint must first be de-inked, creating a sludge that must be disposed ofCost of more efficient packaging material

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Positive ExternalitiesPositive externalities occur when the unpriced by-products of consumption or production benefit other consumers or other firms

For example, people who get inoculated against a disease reduce their own likelihood of contacting the disease, but in the process they also reduce the risk of transmitting the disease to others external benefits to others

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Positive ExternalitiesEducation also confers external benefits on society as a whole because those who acquire more education

Become better citizensAre better able to support themselves and their familiesLess likely to require public assistance Less likely to resort to crime

Thus, education confers private benefits and additional social benefits to others

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Positive ExternalitiesWhen positive externalities are present, decisions based on private marginal benefits result in less than the socially optimal quantity of the good

Hence, they typically point to a market failure, which is why government often gets into the act

When there are external benefits, public policy aims to increase the level of output beyond the private optimum

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1 Externalities and the Environment CHAPTER 17 © 2003 South-Western/Thomson Learning