Public good (economics)
In economics, a public good (also referred to as a social good or collective good) is a good that is both non-excludable and non-rivalrous. For such goods, users cannot be barred from accessing or using them for failing to pay for them. Also, use by one person neither prevents access of other people nor does it reduce availability to others. Therefore, the good can be used simultaneously by more than one person. This is in contrast to a common good such as wild fish stocks in the ocean, which is non-excludable but rivalrous to a certain degree. If too many fish were harvested, the stocks would deplete, limiting the access of fish for others. A public good must be valuable to more than one user, otherwise, the fact that it can be used simultaneously by more than one person would be economically irrelevant.
Capital goods may be used to produce public goods or services that are "...typically provided on a large scale to many consumers."  Unlike other types of economic goods, public goods are described as “non-rivalrous” or “non-exclusive,” and use by one person neither prevents access of other people nor does it reduce availability to others. Similarly, using capital goods to produce public goods may result in the creation of new capital goods. In some cases, public goods or services are considered "...insufficiently profitable to be provided by the private sector.... (and), in the absence of government provision, these goods or services would be produced in relatively small quantities or, perhaps, not at all." 
Public goods include knowledge, official statistics, national security, and common languages. Additionally, flood control systems, lighthouses, and street lighting are also common social goods. Collective goods that are spread all over the face of the earth may be referred to as global public goods. For instance, knowledge is well shared globally. Information about men, women and youth health awareness, environmental issues, and maintaining biodiversity is common knowledge that every individual in the society can get without necessarily preventing others access. Also, sharing and interpreting contemporary history with a cultural lexicon, particularly about protected cultural heritage sites and monuments are other sources of knowledge that the people can freely access. Popular and entertaining tourist attractions, libraries and universities are other examples of public goods.
Many public goods may at times be subject to excessive use resulting in negative externalities affecting all users; for example air pollution and traffic congestion. The closeness of the people while interacting with other people in the public utilities also has appeared to cause negative impact to people. The result of this is a faster and increased spread of infectious diseases such as SARS and COVID-19. Public goods problems are often closely related to the "free-rider" problem, in which people not paying for the good may continue to access it. Thus, the good may be under-produced, overused or degraded. Public goods may also become subject to restrictions on access and may then be considered to be club goods; exclusion mechanisms include toll roads, congestion pricing, and pay television with an encoded signal that can be decrypted only by paid subscribers.
There is a good deal of debate and literature on how to measure the significance of public goods problems in an economy, and to identify the best remedies.
Academic literature on public goods
Paul A. Samuelson is usually credited as the economist who articulated the modern theory of public goods in a mathematical formalism, building on earlier work of Wicksell and Lindahl. In his classic 1954 paper The Pure Theory of Public Expenditure, he defined a public good, or as he called it in the paper a "collective consumption good", as follows:
[goods] which all enjoy in common in the sense that each individual's consumption of such a good leads to no subtractions from any other individual's consumption of that good...
A Lindahl tax is a type of taxation brought forward by Erik Lindahl, an economist from Sweden in 1919. His idea was to tax individuals, for the provision of a public good, according to the marginal benefit they receive. Public goods are costly and eventually someone needs to pay the cost. It is difficult to determine how much each person should pay. So, Lindahl developed a theory of how the expense of public utilities needs to be settled. His argument was that people would pay for the public goods according to the way they benefit from the good. The more a person benefits from these goods, the higher the amount they pay. People are more willing to pay for goods that they value. Taxes are needed to fund public goods and people are willing to bear the burden of taxes. Additionally, the theory dwells on people's willingness to pay for the public good. From the fact that public goods are paid through taxation according to the Lindahl idea, the basic duty of the organization that should provide the people with this services and products is the government. The services and public utility in most cases are part of the many governmental activities that government engage purely for the satisfaction of the public and not generation of profits. In the introductory section of his book, Public Good Theories of the Nonprofit Sector, Bruce R. Kingma stated that;
In the Weisbrod model nonprofit organizations satisfy a demand for public goods, which is left unfilled by government provision. The government satisfies the demand of the median voters and therefore provides a level of the public good less than some citizens'-with a level of demand greater than the median voter's-desire. This unfilled demand for the public good is satisfied by nonprofit organizations. These nonprofit organizations are financed by the donations of citizens who want to increase the output of the public good.
Terminology, and types of goods
Non-rivalrous: accessible by all whilst one's usage of the product does not affect the availability for subsequent use.
Non-excludability: that is, it is impossible to exclude any individuals from consuming the good.
Pure public: when a good exhibits the two traits, non-rivalry and non-excludability, it is referred to as the pure public good.
Private good: The opposite of a public good which does not possess these properties. A loaf of bread, for example, is a private good; its owner can exclude others from using it, and once it has been consumed, it cannot be used by others.
Common-pool resource: A good that is rivalrous but non-excludable. Such goods raise similar issues to public goods: the mirror to the public goods problem for this case is the 'tragedy of the commons'. For example, it is so difficult to enforce restrictions on deep-sea fishing that the world's fish stocks can be seen as a non-excludable resource, but one which is finite and diminishing.
Club goods: are the goods that excludable but are non-rivalrous such as private parks.
Mixed good: final goods that are intrinsically private but that are produced by the individual consumer by means of private and public good inputs. The benefits enjoyed from such a good for any one individual may depend on the consumption of others, as in the cases of a crowded road or a congested national park.
food, clothing, cars, parking spaces
fish stocks, timber, coal
cinemas, private parks, satellite television
free-to-air television, air, national defense
- Replacing the term "rivalry of consumption" with "subtractability of use".
- Conceptualizing subtractability of use and excludability to vary from low to high rather than characterizing them as either present or absent.
- Overtly adding a very important fourth type of good—common-pool resources—that shares the attribute of subtractability with private goods and difficulty of exclusion with public goods. Forests, water systems, fisheries, and the global atmosphere are all common-pool resources of immense importance for the survival of humans on this earth.
- Changing the name of a "club" good to a "toll" good since many goods that share these characteristics are provided by small scale public as well as private associations.
Challenges in identifying public goods
The definition of non-excludability states that it is impossible to exclude individuals from consumption. Technology now allows radio or TV broadcasts to be encrypted such that persons without a special decoder are excluded from the broadcast. Many forms of information goods have characteristics of public goods. For example, a poem can be read by many people without reducing the consumption of that good by others; in this sense, it is non-rivalrous. Similarly, the information in most patents can be used by any party without reducing consumption of that good by others. Official statistics provide a clear example of information goods that are public goods, since they are created to be non-excludable. Creative works may be excludable in some circumstances, however: the individual who wrote the poem may decline to share it with others by not publishing it. Copyrights and patents both encourage the creation of such non-rival goods by providing temporary monopolies, or, in the terminology of public goods, providing a legal mechanism to enforce excludability for a limited period of time. For public goods, the "lost revenue" of the producer of the good is not part of the definition: a public good is a good whose consumption does not reduce any other's consumption of that good.
Debate has been generated among economists whether such a category of "public goods" exists. Steven Shavell has suggested the following:
when professional economists talk about public goods they do not mean that there are a general category of goods that share the same economic characteristics, manifest the same dysfunctions, and that may thus benefit from pretty similar corrective solutions...there is merely an infinite series of particular problems (some of overproduction, some of underproduction, and so on), each with a particular solution that cannot be deduced from the theory, but that instead would depend on local empirical factors.
There is a common misconception that public goods are goods provided by the public sector. Although it is often the case that government is involved in producing public goods, this is not always true. Public goods may be naturally available, or they may be produced by private individuals, by firms, or by non-state groups, called collective action.
The theoretical concept of public goods does not distinguish geographic region in regards to how a good may be produced or consumed. However, some theorists, such as Inge Kaul, use the term "global public good" for a public good which is non-rivalrous and non-excludable throughout the whole world, as opposed to a public good which exists in just one national area. Knowledge has been argued as an example of a global public good, but also as a commons, the knowledge commons.
Graphically, non-rivalry means that if each of several individuals has a demand curve for a public good, then the individual demand curves are summed vertically to get the aggregate demand curve for the public good. This is in contrast to the procedure for deriving the aggregate demand for a private good, where individual demands are summed horizontally.
Digital Public Goods
Digital public goods include software, data sets, AI models, standards and content that are open source.
Use of the term “digital public good” appears as early as April, 2017 when Nicholas Gruen wrote Building the Public Goods of the Twenty-First Century, and has gained popularity with the growing recognition of the potential for new technologies to be implemented at scale to effectively serve people. Digital technologies have also been identified by countries, NGOs and private sector entities as a means to achieve the Sustainable Development Goals (SDGs).
A digital public good is defined by the UN Secretary-General’s Roadmap for Digital Cooperation, as: “open source software, open data, open AI models, open standards and open content that adhere to privacy and other applicable laws and best practices, do no harm, and help attain the SDGs.”
Common examples of public goods include
- public fireworks
- clean air and other environmental goods
- information goods, such as official statistics
- open-source software
- public television
- herd immunity
|Class and type of Good||Nonexcludable||Nonrival||Common problem|
|Universal human rights||Partly||Yes||Underuse (Repression)|
|Knowledge||Partly||Yes||Underuse (lack of access)|
|Internet||Partly||Yes||Underuse (Entry Barriers)|
Shedding light on some mis-classified public goods
- Some goods, like orphan drugs, require special governmental incentives to be produced, but cannot be classified as public goods since they do not fulfill the above requirements (non-excludable and non-rivalrous.)
- Law enforcement, streets, libraries, museums, and education are commonly misclassified as public goods, but they are technically classified in economic terms as quasi-public goods because excludability is possible, but they do still fit some of the characteristics of public goods.
- The provision of a lighthouse is a standard example of a public good, since it is difficult to exclude ships from using its services. No ship's use detracts from that of others, but since most of the benefit of a lighthouse accrues to ships using particular ports, lighthouse maintenance can be profitably bundled with port fees (Ronald Coase, The Lighthouse in Economics 1974). This has been sufficient to fund actual lighthouses.
- Technological progress can create new public goods. The most simple examples are street lights, which are relatively recent inventions (by historical standards). One person's enjoyment of them does not detract from other persons' enjoyment, and it currently would be prohibitively expensive to charge individuals separately for the amount of light they presumably use.
- Official statistics are another example. The government's ability to collect, process and provide high-quality information to guide decision-making at all levels has been strongly advanced by technological progress. On the other hand, a public good's status may change over time. Technological progress can significantly impact excludability of traditional public goods: encryption allows broadcasters to sell individual access to their programming. The costs for electronic road pricing have fallen dramatically, paving the way for detailed billing based on actual use.
Free rider problem
The free rider problem is a primary issue in collective decision-making. An example is that some firms in a particular industry will choose not to participate in a lobby which purpose is to affect government policies that could benefit the industry, in assumption that there are enough participants that would cause a favourable change. Free rider problem is also a form of market failure, in which market-like behavior of individual gain-seeking does not produce economically efficient results. The production of public goods results in positive externalities which are not remunerated. If private organizations do not reap all the benefits of a public good which they have produced, their incentives to produce it voluntarily might be insufficient. Consumers can take advantage of public goods without contributing sufficiently to their creation. This is called the free rider problem, or occasionally, the "easy rider problem". If too many consumers decide to "free-ride", private costs exceed private benefits and the incentive to provide the good or service through the market disappears. The market thus fails to provide a good or service for which there is a need.
The free rider problem depends on a conception of the human being as homo economicus: purely rational and also purely selfish—extremely individualistic, considering only those benefits and costs that directly affect him or her. Public goods give such a person an incentive to be a free rider.
For example, consider national defence, a standard example of a pure public good. Suppose homo economicus thinks about exerting some extra effort to defend the nation. The benefits to the individual of this effort would be very low, since the benefits would be distributed among all of the millions of other people in the country. There is also a very high possibility that he or she could get injured or killed during the course of his or her military service. On the other hand, the free rider knows that he or she cannot be excluded from the benefits of national defense, regardless of whether he or she contributes to it. There is also no way that these benefits can be split up and distributed as individual parcels to people. The free rider would not voluntarily exert any extra effort, unless there is some inherent pleasure or material reward for doing so (for example, money paid by the government, as with an all-volunteer army or mercenaries).
The free-riding problem is even more complicated than it was thought to be until recently. Any time non-excludability results in failure to pay the true marginal value (often called the "demand revelation problem"), it will also result in failure to generate proper income levels, since households will not give up valuable leisure if they cannot individually increment a good. This implies that, for public goods without strong special interest support, under-provision is likely since cost-benefit analysis is being conducted at the wrong income levels, and all of the un-generated income would have been spent on the public good, apart from general equilibrium considerations.
In the case of information goods, an inventor of a new product may benefit all of society, but hardly anyone is willing to pay for the invention if they can benefit from it for free. In the case of an information good, however, because of its characteristics of non-excludability and also because of almost zero reproduction costs, commoditization is difficult and not always efficient even from a neoclassical economic point of view.
Efficient production levels of public goods
The Pareto optimal provision of a public good in a society occurs when the sum of the marginal valuations of the public good (taken across all individuals) is equal to the marginal cost of providing that public good. These marginal valuations are, formally, marginal rates of substitution relative to some reference private good, and the marginal cost is a marginal rate of transformation that describes how much of that private good it costs to produce an incremental unit of the public good.) This contrasts to the Pareto optimality condition of private goods, which equates each consumer's valuation of the private good to its marginal cost of production.
For an example, consider a community of just two consumers and the government is considering whether or not to build a public park. One person is prepared to pay up to $200 for its use, while the other is willing to pay up to $100. The total value to the two individuals of having the park is $300. If it can be produced for $225, there is a $75 surplus to maintaining the park, since it provides services that the community values at $300 at a cost of only $225.
The classical theory of public goods defines efficiency under idealized conditions of complete information, a situation already acknowledged in Wicksell (1896). Samuelson emphasized that this poses problems for the efficient provision of public goods in practice and the assessment of an efficient Lindahl tax to finance public goods, because individuals have incentives to underreport how much they value public goods. Subsequent work, especially in mechanism design and the theory of public finance developed how valuations and costs could actually be elicited in practical conditions of incomplete information, using devices such as the Vickrey–Clarke–Groves mechanism. Thus, deeper analysis of problems of public goods motivated much work that is at the heart of modern economic theory.
Other problems associated with public goods
Darren Bates writes about urbanization and the relation that it has with the public goods. In his write up, Bates state that currently, the population of the people living in urban centers is increasing day by day. He also mentions the impact of the urban development;
We are at a historic moment in urban development. According to the United Nations, more than half of the world’s population now lives in urban areas. By 2050, that figure will rise to 6.5 billion people — two-thirds of all humanity, 15% with disabilities, making urbanization one of the 21st century’s most trans-formative and challenging trends. In many places, this trend towards rapid urbanization goes hand in hand with the creation of more disparities, inequalities, and discrimination, [...] 
As such, there is a continued and ever increasing concern of the matter of public goods with the urbanization. Therefore, measure that have to be taken to curb the seriousness of the problems that the public good are experiencing has a lot to do with the idea developed by Mahatma.
According to Mahatma Gandhi, several developmental aspects to grand the people with the public goods has for many years gone astray. As recorded by Thakker, Gandhi had a different perspective of the public goods;
"...need to protect the environment and to guard against the abuse of natural resources. Our mindless destruction of natural wealth is alarming. Mighty projects, big dams, giant industries and other massive ventures raise questions about the quality of life affected by them. The quest for the mirage of material development often leads to the destruction of forests, ecological imbalances, scarcity of water, soil erosion, silting of rivers and desertification pose grave dangers to environment."
The struggle to get access to the public goods has resulted in the rapid growth of urbanization. As more people come to get the service, the natural provision of the globe is affected resulting in other side effects. With the aim to achieve provision of public services several other challenges arise;
- Environmental degradation
- Ecological imbalances (e.g. over fishing causing extinction of some fish species)
- Spread of infectious diseases (SARS and CoViD-19)
- Air Pollution and
- Traffic Congestion
Local public goods
The basic theory of public goods as discussed above begins with situations where the level of a public good (e.g., quality of the air) is equally experienced by everyone. However, in many important situations of interest, the incidence of benefits and costs is not so simple. For example, when people keep an office clean or monitor a neighborhood for signs of trouble, the benefits of that effort accrue to some people (those in their neighborhoods) more than to others. The overlapping structure of these neighborhoods is often modeled as a network. (When neighborhoods are totally separate, i.e., non-overlapping, the standard model is the Tiebout model.)
Recently, economists have developed the theory of local public goods with overlapping neighborhoods, or public goods in networks: both their efficient provision, and how much can be provided voluntarily in a non-cooperative equilibrium. Voluntary provision is typically below the efficient level, and equilibrium outcomes tend to involve strong specialization, with a few individuals contributing heavily and their neighbors free-riding on those contributions. Other theoretical models have examined how social networks create utility interdependence and can reduce some of the inefficencies inherent in public goods provision.
It would be rather simple to assume that all public goods are owned by public sector. However, the management of the utilities in the hands of the public, clearly indicate less benefit to the users due to free-riders. Thus, a question regarding public goods being owned by the public or the private sector rises.
Economic theorists such as Oliver Hart (1995) argue that ownership matters for investment incentives when contracts are incomplete. The incomplete contracting paradigm has been applied to public goods by Besley and Ghatak (2001). They consider the government and a non-governmental organization (NGO) who can both make investments to provide a public good. Besley and Ghatak show that the party who has a larger valuation for the public good should be the owner, regardless of whether the government or the NGO has a better investment technology. This result contrasts with the case of private goods studied by Hart (1995), where the party with the better investment technology should be the owner. However, more recently it has been shown that the investment technology matters also in the public-good case when a party is indispensable or when there are bargaining frictions between the government and the NGO.
- Anti-rival good
- Lindahl tax, a method proposed by Erik Lindahl for financing public goods
- Private-collective model of innovation, which explains the creation of public goods by private investors
- Public bad
- Public trust doctrine
- Public goods game, a standard of experimental economics
- Public works, government-financed constructions
- Tragedy of the commons
- Tragedy of the anticommons
- Rivalry (economics)
- Quadratic funding, a mechanism to allocate funding for the production of public goods based on democratic principles
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|Library resources about |
Public good (economics)
- Public Goods: A Brief Introduction, by The Linux Information Project (LINFO)
- Cowen, Tyler (2008). "Public Goods". In David R. Henderson (ed.). Concise Encyclopedia of Economics (2nd ed.). Indianapolis: Library of Economics and Liberty. ISBN 978-0-86597-665-8. OCLC 237794267.
- Global Public Goods – analysis from Global Policy Forum
- The Nature of Public Goods
- Hardin, Russell, "The Free Rider Problem", The Stanford Encyclopedia of Philosophy (Spring 2013 Edition), Edward N. Zalta (ed.)