Externality


Externality

In economics, an externality (or transaction spillover) is a cost or benefit, not transmitted through prices,[1] incurred by a party who did not agree to the action causing the cost or benefit. The benefits of externalities, in this case, is called a positive externality or external benefit, while its cost is called a negative externality or external costs.

In these cases of both negative and positive externalities,in a competitive market, prices do not reflect the full costs or benefits of producing or consuming a product or service. Also, producers and consumers may neither bear all of the costs nor reap all of the benefits of the economic activity, and too much or too little of the goods will be produced or consumed in terms of overall costs and benefits to society. For example, manufacturing that causes air pollution imposes costs on the whole society, while fire-proofing a home improves the fire safety of neighbors. If there exist external costs such as pollution, the good will be overproduced by a competitive market, as the producer does not take into account the external costs when producing the good. If there are external benefits, such as in areas of education or public safety, too little of the good would be produced by private markets as producers and buyers do not take into account the external benefits to others. Here, overall cost and benefit to society is defined as the sum of the economic benefits and costs for all parties involved.[2][3]

External costs and benefits

Contents

Implications

Standard economic theory states that any voluntary exchange is mutually beneficial to both parties involved in the trade. This is because buyers or sellers would not trade if either thought it not beneficial to themselves. However, an exchange can cause additional effects on third parties. From the perspective of those affected, these effects may be negative (pollution from a factory), or positive (honey bees kept for honey that also pollinate crops). Welfare economics has shown that the existence of externalities results in outcomes that are not socially optimal. Those who suffer from external costs do so involuntarily, while those who enjoy external benefits do so at no cost.

A voluntary exchange may reduce societal welfare if external costs exist. The person who is affected by the negative externalities in the case of air pollution will see it as lowered utility: either subjective displeasure or potentially explicit costs, such as higher medical expenses. The externality may even be seen as a trespass on their lungs, violating their property rights. Thus, an external cost may pose an ethical or political problem. Alternatively, it might be seen as a case of poorly defined property rights, as with, for example, pollution of bodies of water that may belong to no-one (either figuratively, in the case of publicly-owned, or literally, in some countries and/or legal traditions).

On the other hand, a positive externality would increase the utility of third parties at no cost to them. Since collective societal welfare is improved, but the providers have no way of monetizing the benefit, less of the good will be produced than would be optimal for society as a whole. Goods with positive externalities include education (believed to increase societal productivity and well-being; but controversial, as these benefits may be internalized), public health initiatives (which may reduce the health risks and costs for third parties for such things as transmittable diseases) and law enforcement. Positive externalities are often associated with the free rider problem. For example, individuals who are vaccinated reduce the risk of contracting the relevant disease for all others around them, and at high levels of vaccination, society may receive large health and welfare benefits; but any one individual can refuse vaccination, still avoiding the disease by "free riding" on the costs borne by others.

There are a number of potential means of improving overall social utility when externalities are involved. The market-driven approach to correcting externalities is to "internalize" third party costs and benefits, for example, by requiring a polluter to repair any damage caused. But, in many cases internalizing costs or benefits is not feasible, especially if the true monetary values cannot be determined.

.

Laissez-faire economists such as Friedrich Hayek and Milton Friedman sometimes refer to externalities as "neighborhood effects" or "spillovers", although externalities are not necessarily minor or localized. Simillarly, Ludwig Heinrich Edler von Mises argues that externalities arise from lack of "clear personal property defination".

Private and social costs: social costs are the spillover costs to society (society pays off the costs), while private costs are the costs given to the individual firms or producer.

Examples

Negative

A negative externality is an action of a product on consumers that imposes a negative side effect on a third party; it is "social cost". Many negative externalities (also called "external costs" or "external diseconomies") are related to the environmental consequences of production and use. The article on environmental economics also addresses externalities and how they may be addressed in the context of environmental issues.

  • Air pollution from burning fossil fuels causes damages to crops, (historic) buildings and public health. The most extensive and integrated effort to quantify and monetise these impacts was in the European ExternE project series.[4][5]
  • Anthropogenic climate change is attributed to greenhouse gas emissions from burning oil, gas, and coal. The Stern Review on the Economics Of Climate Change says "Climate change presents a unique challenge for economics: it is the greatest example of market failure we have ever seen."[6]
  • Water pollution by industries that adds poisons to the water, which harm plants, animals, and humans.
  • Systemic risk describes the risks to the overall economy arising from the risks which the banking system takes. A condition of moral hazard can occur in the absence of well-designed banking regulation,[7] or in the presence of badly designed regulation.[8]
  • Industrial farm animal production, on the rise in the 20th century, resulted in farms that were easier to run, with fewer and often less-skilled employees, and a greater output of uniform animal products. However, the externalities with these farms include "contributing to the increase in the pool of antibiotic-resistant bacteria because of the overuse of antibiotics; air quality problems; the contamination of rivers, streams, and coastal waters with concentrated animal waste; animal welfare problems, mainly as a result of the extremely close quarters in which the animals are housed."[9][10]
  • The harvesting by one fishing company in the ocean depletes the stock of available fish for the other companies and overfishing may be the result. The stock fish is an example of a common property resource, and that, in the absence of appropriate environmental governance, is vulnerable to the Tragedy of the commons.
  • When car owners use roads, they impose congestion costs and higher accidents risks on all other users.
  • A business may purposely underfund one part of their business, such as their pension funds, in order to push the costs onto someone else, creating an externality. Here, the "cost" is that of providing minimum social welfare or retirement income; economists more frequently attribute this problem to the category of moral hazards.
  • Consumption by one consumer causes prices to rise and therefore makes other consumers worse off, perhaps by reducing their consumption. These effects are sometimes called "pecuniary externalities" and are distinguished from "real externalities" or "technological externalities". Pecuniary externalities appear to be externalities, but occur within the market mechanism and are not a source of market failure or inefficiency.[11]
  • The consumption of alcohol when it leads to traffic or other accidents that injure or kill others.
  • Shared costs of declining health and vitality caused by smoking and/or alcohol abuse. Here, the "cost" is that of providing minimum social welfare. Economists more frequently attribute this problem to the category of moral hazards, the prospect that a party insulated from risk may behave differently from the way they would if they were fully exposed to the risk. For example, an individual with insurance against automobile theft may be less vigilant about locking his car, because the negative consequences of automobile theft are (partially) borne by the insurance company.
  • The cost of storing nuclear waste from nuclear plants for more than 1,000 years (over 100,000 for some types of nuclear waste) is included in the cost of the electricity the plant produces, in the form of a fee paid to the government and held in the Nuclear Waste Fund. Conversely, the costs of managing the long term risks of disposal of chemicals, which may remain permanently hazardous, is not commonly internalized in prices. The USEPA regulates chemicals for periods ranging from 100 years to a maximum of 10,000 years, without respect to potential long-term hazard.
  • Antibiotic overuse contributes to antimicrobial resistance, reducing the future effectiveness of antibiotics. Individuals do not consider this efficacy cost when making usage decisions, leading to socially sub-optimal antibiotic consumption. Government policies proposed to preserve future antibiotic effectiveness include educational campaigns, regulation, Pigouvian taxes, and patents.
  • There is evidence that crime in a neighborhood increases after the opening of a liquor store.[12] Liquor stores may draw an undesirable class of citizens into the neighborhood to shop and hang out. They may also cause more people in the area to drink; such people may then proceed to commit acts in the neighborhood that they would not normally do, or else these drunk people may become easy targets for the crimes of others. Even if the crimes start out small, they may eventually become much worse if not effectively addressed (broken windows theory). Liquor stores are more likely to be open late into the night than other stores, and may result in increased noise levels which harm property values in the community.

Positive

Examples of positive externalities (beneficial externality, external benefit, external economy, or Merit goods) include:

  • A beekeeper keeps the bees for their honey. A side effect or externality associated with his activity is the pollination of surrounding crops by the bees. The value generated by the pollination may be more important than the value of the harvested honey.
  • An individual planting an attractive garden in front of his or her house may provide benefits to others living in the area, and even financial benefits in the form of increased property values for all property owners.
  • A public organization that coordinates the control of an infectious disease preventing others in society from getting sick.
  • An individual buying a product that is interconnected in a network (e.g., a video cellphone) will increase the usefulness of such phones to other people who have a video cellphone. When each new user of a product increases the value of the same product owned by others, the phenomenon is called a network externality or a network effect. Network externalities often have "tipping points" where, suddenly, the product reaches general acceptance and near-universal usage.
  • Knowledge spillover of inventions and information - once an invention (or most other forms of practical information) is discovered or made more easily accessible, others benefit by exploiting the invention or information. Patent law is a mechanism to allow the inventor or creator to benefit from a temporary, state-protected monopoly in return for "sharing" the information through publication or other means.
  • Sometimes the better part of a benefit from a good comes from having the option to buy something rather than actually having to buy it. A private fire department that charged only those people whose house fire they responded to, would arguably provide a positive externality to the entire community at the expense of an unlucky few who actually had to pay. Some form of insurance could be a solution in such cases, as long as people can accurately evaluate the benefit they have from the option.
    • The major downside to such a system is that the service provider has no obligation to provide the service. In 2010 in Tennessee, a home caught fire and the fire department refused to put the fire out because the household had failed to pay their fire fee of $75.00. In this instance, House A (Did not pay their fee) and the fire department refused to respond to quell the fire. After the fire spread to the neighbor’s home, the fire department responded and put House B’s (Paid the fee) fire out. House A eventually burned to the ground and House B incurred some fire damage but was generally still stable structurally etc. If the fee is not purchased, you will not receive the fire service. The optimal solution to this externality would be to instead charge a mandatory tax rather than an optional fee.
  • The sprinkler systems could eliminate the need for a fire department if it effectively eliminates the fire. “California and Pennsylvania, starting Jan. 1, 2011, will be the first two states in the country to require sprinklers in every new home based on the International Code Council (ICC) mandating the installation of residential fire sprinklers in all new one- and two-family residences, including townhouses in the 2009 International Residential Code (IRC). Other states, however, plan to adopt the residential fire sprinkler mandate but delay its implementation, while other states still oppose it.”(www.contractormag.com) This would have the potential to reduce the need of a large fire department in the long run. The argument could be made that the installation of a sprinkler system could pay for itself quickly, instead of having to pay a fire fee each year. Similarly, an “opt-in” policy of this nature would enable residents to pay the fire protection fee if they desired fire service, otherwise, they would not need to worry about being victimized by a neighbor’s “production” of fire damage (cost) to their home.
  • Some studies find that home ownership creates a positive externality in that homeowners are more likely than renters to become actively involved in the local community.[13] A controlled study on the topic, however, disputes that this effect is causal.[14] Still this is often a justification given for why, in the US, interest paid on a home mortgage is an available deduction from the income tax.
  • Education creates a positive externality because more highly educated people are less likely to engage in violent crime. This makes everyone in the community better off, regardless of their level of education.

As noted, externalities (or proposed solutions to externalities) may also imply political conflicts, rancorous lawsuits, and the like. This may make the problem of externalities too complex for the concept of Pareto optimality to handle. Similarly, if too many positive externalities fall outside the participants in a transaction, there will be too little incentive on parties to participate in activities that lead to the positive externalities.

A common solution to providing positive externalities is taxation. A tax requires everyone to pay for a beneficial service, such as police and fire protection, which eliminates the free rider problem. A second way is an Individual mandate, a legal requirement that people purchase a beneficial product, such as insurance. In the United States, the 2010 Patient Protection and Affordable Care Act included a requirement that all citizens purchase health insurance to eliminate the free rider problem.

Positional

Positional externalities refer to a special type of externality that depends on the relative rankings of actors in a situation. Because every actor is attempting to "one up" other actors, the consequences are unintended and economically inefficient.

One example is the phenomenon of "over-education" (referring to post-secondary education) in the North American labour market. In the 1960s, many young middle-class North Americans prepared for their careers by completing a bachelor's degree. However, by the 1990s, many people from the same social milieu were completing master's degrees, hoping to "one up" the other competitors in the job market by signalling their higher quality as potential employees. By the 2000s, some jobs which had previously only demanded bachelor's degrees, such as policy analysis posts, were requiring master's degrees. Some economists argue that this increase in educational requirements was above that which was efficient, and that it was a misuse of the societal and personal resources that go into the completion of these master's degrees.

Another example is the buying of jewelry as a gift for another person, e.g. a spouse. For Husband A to show that he values Wife A more than Husband B values Wife B, Husband A must buy more expensive jewelry than Husband B. As in the first example, the cycle continues to get worse, because every actor positions him or herself in relation to the other actors. This is sometimes called keeping up with the Joneses.

One solution to such externalities is regulations imposed by an outside authority. For the first example, the government might pass a law against firms requiring master's degrees unless the job actually required these advanced skills.

Supply and demand diagram

The usual economic analysis of externalities can be illustrated using a standard supply and demand diagram if the externality can be valued in terms of money. An extra supply or demand curve is added, as in the diagrams below. One of the curves is the private cost that consumers pay as individuals for additional quantities of the good, which in competitive markets, is the marginal private cost. The other curve is the true cost that society as a whole pays for production and consumption of increased production the good, or the marginal social cost.

Similarly there might be two curves for the demand or benefit of the good. The social demand curve would reflect the benefit to society as a whole, while the normal demand curve reflects the benefit to consumers as individuals and is reflected as effective demand in the market.

External costs

The graph below shows the effects of a negative externality. For example, the steel industry is assumed to be selling in a competitive market – before pollution-control laws were imposed and enforced (e.g. under laissez-faire). The marginal private cost is less than the marginal social or public cost by the amount of the external cost, i.e., the cost of air pollution and water pollution. This is represented by the vertical distance between the two supply curves. It is assumed that there are no external benefits, so that social benefit equals individual benefit.

Demand curve with external costs; if social costs are not accounted for price is too low to cover all costs and hence quantity produced is unnecessarily high (because the producers of the good and their customers are essentially underpaying the total, real factors of production.)

If the consumers only take into account their own private cost, they will end up at price Pp and quantity Qp, instead of the more efficient price Ps and quantity Qs. These latter reflect the idea that the marginal social benefit should equal the marginal social cost, that is that production should be increased only as long as the marginal social benefit exceeds the marginal social cost. The result is that a free market is inefficient since at the quantity Qp, the social benefit is less than the social cost, so society as a whole would be better off if the goods between Qp and Qs had not been produced. The problem is that people are buying and consuming too much steel.

This discussion implies that negative externalities (such as pollution) is more than merely an ethical problem. The problem is one of the disjuncture between marginal private and social costs that is not solved by the free market. It is a problem of societal communication and coordination to balance costs and benefits. This also implies that pollution is not something solved by competitive markets. Some collective solution is needed, such as a court system to allow parties affected by the pollution to be compensated, government intervention banning or discouraging pollution, or economic incentives such as green taxes.

External benefits

The graph below shows the effects of a positive or beneficial externality. For example, the industry supplying smallpox vaccinations is assumed to be selling in a competitive market. The marginal private benefit of getting the vaccination is less than the marginal social or public benefit by the amount of the external benefit (for example, society as a whole is increasingly protected from smallpox by each vaccination, including those who refuse to participate). This marginal external benefit of getting a smallpox shot is represented by the vertical distance between the two demand curves. Assume there are no external costs, so that social cost equals individual cost.

Supply curve with external benefits; when the market does not account for additional social benefits of a good both the price for the good and the quantity produced are lower than the market could bear.

If consumers only take into account their own private benefits from getting vaccinations, the market will end up at price Pp and quantity Qp as before, instead of the more efficient price Ps and quantity Qs. These latter again reflect the idea that the marginal social benefit should equal the marginal social cost, i.e., that production should be increased as long as the marginal social benefit exceeds the marginal social cost. The result in an unfettered market is inefficient since at the quantity Qp, the social benefit is greater than the societal cost, so society as a whole would be better off if more goods had been produced. The problem is that people are buying too few vaccinations.

The issue of external benefits is related to that of public goods, which are goods where it is difficult if not impossible to exclude people from benefits. The production of a public good has beneficial externalities for all, or almost all, of the public. As with external costs, there is a problem here of societal communication and coordination to balance benefits and costs. This also implies that vaccination is not something solved by competitive markets. The government may have to step in with a collective solution, such as subsidizing or legally requiring vaccine use. If the government does this, the good is called a merit good.

Possible solutions

There are at least four general types of solutions to the problem of externalities:

  • Criminalization: As with prostitution in some countries, drugs, commercial fraud, and many types of environmental and public health laws.
  • Civil Tort law: For example, class action by smokers, various product liability suits.
  • Government provision: As with lighthouses, education, and national defense.
  • Pigovian taxes or subsidies intended to redress economic injustices or imbalances.

A Pigovian tax is a tax imposed that is equal in value to the negative externality. The result is that the market outcome would be reduced to the efficient amount. A side effect is that revenue is raised for the government, reducing the amount of distortionary taxes that the government must impose elsewhere. Economists prefer Pigovian taxes and subsidies as being the least intrusive and most efficient method to resolve externalities.

However, the most common type of solution is tacit agreement through the political process. Governments are elected to represent citizens and to strike political compromises between various interests. Normally governments pass laws and regulations to address pollution and other types of environmental harm. These laws and regulations can take the form of "command and control" regulation (such as setting standards, targets, or process requirements), or environmental pricing reform (such as ecotaxes or other pigovian taxes, tradable pollution permits or the creation of markets for ecological services). The second type of resolution is a purely private agreement between the parties involved.

Government intervention may not always be needed. Traditional ways of life may have evolved as ways to deal with external costs and benefits. Alternatively, democratically-run communities can agree to deal with these costs and benefits in an amicable way. Externalities can sometimes be resolved by agreement between the parties involved. This resolution may even come about because of the threat of government action.

Ronald Coase argued that if all parties involved can easily organize payments so as to pay each other for their actions, then an efficient outcome can be reached without government intervention. Some take this argument further, and make the political claim that government should restrict its role to facilitating bargaining among the affected groups or individuals and to enforcing any contracts that result. This result, often known as the Coase Theorem, requires that

  • Property rights be well defined
  • People act rationally
  • Transaction costs be minimal

If all of these conditions apply, the private parties can bargain to solve the problem of externalities.

This theorem would not apply to the steel industry case discussed above. For example, with a steel factory that trespasses on the lungs of a large number of individuals with pollution, it is difficult if not impossible for any one person to negotiate with the producer, and there are large transaction costs. Hence the most common approach may be to regulate the firm (by imposing limits on the amount of pollution considered "acceptable") while paying for the regulation and enforcement with taxes. The case of the vaccinations would also not satisfy the requirements of the Coase Theorem. Since the potential external beneficiaries of vaccination are the people themselves, the people would have to self-organize to pay each other to be vaccinated. But such an organization that involves the entire populace would be indistinguishable from government action.

In some cases, the Coase theorem is relevant. For example, if a logger is planning to clear-cut a forest in a way that has a negative impact on a nearby resort, the resort-owner and the logger could, in theory, get together to agree to a deal. For example, the resort-owner could pay the logger not to clear-cut – or could buy the forest. The most problematic situation, from Coase's perspective, occurs when the forest literally does not belong to anyone; the question of "who" owns the forest is not important, as any specific owner will have an interest in coming to an agreement with the resort owner (if such an agreement is mutually beneficial).

See also

Notes

  1. ^ Externality vs Public Goods Hanming Fang, Duke University
  2. ^ J.J. Laffont (2008). "externalities," The New Palgrave Dictionary of Economics, 2nd Ed. Abstract.
  3. ^ Kenneth J. Arrow (1969). "The Organization of Economic Activity: Issues Pertinent to the Choice of Market versus Non-market Allocations," in Analysis and Evaluation of Public Expenditures: The PPP System. Washington, D.C., Joint Economic Committee of Congress. PDF reprint as pp. 1-16 (press +).
  4. ^ Torfs R, Int Panis L, De Nocker L, Vermoote S (2004). Peter Bickel and Rainer Friedrich. ed. "Externalities of Energy Methodology 2005 Update Other impacts: ecosystems and biodiversity". EUR 21951 EN - Extern E - (European Commission Publications Office, Luxembourg): 229–237. 
  5. ^ Rabl A, Hurley F, Torfs R, Int Panis L, De Nocker L, Vermoote S, Bickel P, Friedrich R, Droste-Franke B, Bachmann T, Gressman A, Tidblad J. Peter Bickel and Rainer Friedrich. ed. Externalities of Energy Methodology 2005 Update, Impact pathway Approach Exposure-Response functions. European Commission Publications Office, Luxembourg, 2005. pp. 75–129. 
  6. ^ Stern, Nicholas (2006). "Introduction". The Economics of Climate Change The Stern Review. Cambridge University Press. ISBN 9780521700801. http://www.hm-treasury.gov.uk/d/Part_I_Introduction_group.pdf 
  7. ^ http://papers.ssrn.com/sol3/papers.cfm?abstract_id=1293468
  8. ^ De Bandt, O.; Hartmann, P. (1998). Risk Measurement and Systemic Risk: 37–84. http://www.imes.boj.or.jp/cbrc/cbrc-02.pdf. 
  9. ^ Weiss, Rick (2008-04-30). "Report Targets Costs Of Factory Farming". Washington Post. http://www.washingtonpost.com/wp-dyn/content/article/2008/04/29/AR2008042902602_pf.html. 
  10. ^ Pew Commission on Industrial Farm Animal Production. "Proc Putting Meat on The Table: Industrial Farm Animal Production in America". The Johns Hopkins Bloomberg School of Public Health. http://www.ncifap.org/reports/. .
  11. ^ Liebowitz, S.J.; Margolis, Stephen E. (1994). "Network externality: An uncommon tragedy". The Journal of Economic Perspectives (American Economic Association) 8 (2): 133–150. JSTOR 2138540.  (free version http://www.econ-pol.unisi.it/didattica/ecreti/Liebowitz-Margolis1994.pdf)
  12. ^ http://www.colgate.edu/portaldata/imagegallerywww/2050/ImageGallery/teh_jobmktpaper.pdf
  13. ^ Glaeser, Edward L. and Shapiro (2002). "The Benefits of the Home Mortgage Interest Deduction". Social Science Research Network. SSRN 342440. 
  14. ^ . http://ideas.repec.org/a/eee/juecon/v67y2010i3p249-258.html. 

References

  • Definition
  • Pigou, A.C. (1920). Economics of Welfare. Macmillan and Co.. 
  • Baumol W.J. (1972). "On Taxation and the Control of Externalities". American Economic Review 62 (3): 307–322. JSTOR 1803378. 
  • Tullock, G. (2005). Public Goods, Redistribution and Rent Seeking. Edward Elgar Publishing, Inc.. ISBN 1-84376-637-X. 
  • Martin Weitzman (October 1974). "Prices vs. Quantities". The Review of Economic Studies 41 (4): 477–491. doi:10.2307/2296698. JSTOR 2296698. 

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