Market Failure: Externalities, Public Goods, and Common Resources
Market Failure: Definition and Causes
Market failure occurs when a market will not or cannot lead to the optimal economic outcome. This is in contrast to efficient markets (e.g., for ice cream) where, under certain assumptions, outcomes are deemed best. Market failures often arise because there is some value without a clear property right.
The Problem of Property Rights
In cases like a polluting factory, the air in the vicinity lacks a defined property right. It's unclear if the factory has the right to pollute or if citizens have the right to clean air. Without this assigned property right, externalities emerge because actions impact something of value without clear ownership or repercussions. When something of value lacks a property right, it also cannot have a price. Markets require suppliers, consumers, and an equilibrium of supply and demand to establish prices. If no one owns something, no one can sell it, and thus no market can form. Consequently, without a market, the "invisible hand" cannot guide economic efficiency, necessitating government intervention.
Government Solutions for Externalities
Market failures due to externalities are situations where government, representing societal interests, can improve outcomes. We've previously discussed several approaches:
Regulation: The government imposes specific rules or standards. For instance, the EPA (Environmental Protection Agency) sets environmental standards based on expert consultations (public health experts, production engineers, etc.) which factories must adhere to.
Taxes or Subsidies: This involves financial incentives or disincentives. Taxes can be levied on polluters (e.g., carbon tax) to disincentivize activities that generate external costs. Subsidies can be given to organizations or operations that produce external benefits (e.g., funding schools, which benefit society beyond the direct users).
Tradable Permits: Economists often prefer this method, which combines elements of regulation and market mechanisms. The government sets a total limit on (e.g., pollution) and allocates permits to relevant entities. These permits can then be traded in a market. This approach allows the market to determine the most cost-effective way to achieve the regulated total amount.
Note: All three techniques (regulation, taxes/subsidies, tradable permits) can achieve the same environmental goal (e.g., same amount of clean air). The choice between them is a social and political decision, not one based on differential environmental harm.
Assigning Property Rights (Coase Theorem): As previously alluded to, the government can assign a property right. The Coase Theorem suggests that if property rights are clearly defined, and transaction costs are low, parties can bargain with each other to reach an efficient outcome, regardless of who initially holds the property right. For example, a neighbor causing a disturbance might negotiate with those affected, offering compensation (e.g., noise-canceling headphones) in exchange for continuing the activity, if both parties achieve a "win-win" situation through bargaining.
These solutions are designed to address various types of externalities, highlighting the important role of government in situations like funding schools or regulating natural resources.
Understanding Types of Goods: Excludability and Rivalry
To understand other forms of market failure, two fundamental concepts are introduced:
Excludable: A good or service is excludable if people can be prevented from using it. If you own something, you can legally keep others from using it. For example, your laptop is excludable (theft is not allowed). A country club with a fence and guard also has an excludable swimming pool. A public lecture, however, is generally not excludable in terms of presence, though the credential (degree) obtained from the lecture might be.
Rival: A good or service is rival if one person's use of it diminishes others' ability to use it. For example, only one person can effectively use a laptop at a time, making it rival. Sharing a Spotify account can lead to issues if multiple people use it simultaneously, making it rival in practice. A lecture, for the most part, is not rival; one student listening does not prevent another from listening. However, if a degree's prestige is diminished by too many recipients, the degree itself could become more rivalrous.
The 2x2 Matrix of Goods
These two dimensions (excludability and rivalry) create a four-quadrant classification for goods, which helps identify when markets work well and when they fail:
Private Goods (Excludable and Rival):
Description: These are goods where individuals can be prevented from using them, and one person's use diminishes another's ability to use them.
Examples: Your laptop, shoes, food.
Market Function: This is the ideal area for markets. Capitalism is highly effective at distributing private goods because ownership and consumption are clear and mutually exclusive.
Club Goods / Artificially Scarce Goods (Excludable but Not Rival):
Description: People can be prevented from using these, but one person's use does not significantly diminish another's ability to use them, at least up to a certain point.
Examples: Spotify, Netflix, a private country club with a large, uncrowded pool. Access is restricted (e.g., by subscription or membership), but once you have access, others' use often doesn't affect your experience significantly.
Market Challenges: Password sharing for streaming services is an example of market leakage that challenges business models, as the non-rival nature encourages unauthorized use.
Common Resources (Not Excludable but Rival):
Description: These goods are available to everyone (non-excludable), but their use by one person diminishes their availability or quality for others (rival).
Examples: Public Wi-Fi (becomes slow when many people use it), a public swimming pool (gets crowded), fish in the ocean, forests, grazing land (the "commons").
Market Challenges: These lead to the "tragedy of the commons" (discussed below).
Public Goods (Not Excludable and Not Rival):
Description: These goods cannot prevent anyone from using them, and one person's use does not diminish others' ability to use them.
Examples: A fire alarm in a building, a fireworks show on July 4th, national defense.
Market Challenges: These goods lead to the "free rider problem" (discussed below) because individuals have no incentive to pay for something they can get for free.
Public Goods and the Free Rider Problem
Public goods, being non-excludable and non-rival, pose a significant market failure.
The Free Rider Problem
Definition: The free rider problem occurs when individuals can enjoy the benefits of a good or service without paying for it. People have an incentive to "free ride" on others' contributions.
Scenario: Consider a fireworks show. It costs money to produce, but it's non-excludable (anyone nearby can see it) and non-rival (one person watching doesn't spoil it for another). If a private company produces fireworks, they cannot compel people to pay because everyone can enjoy it for free. Consequently, in a purely market-based economy, fireworks shows simply wouldn't happen because there's no profit incentive. The producer provides a positive externality to bystanders, but receives no compensation.
Individual Incentives: If an attempt were made to collect voluntary contributions for a fireworks show, individuals would have an incentive to understate their true value for the show. If you value a show at 100, admitting this might mean you have to pay that amount. However, if you say you value it at 0.25, you'll only pay 0.25. Even if you pay nothing, if enough others contribute, you still get to enjoy the show for free. This is especially prevalent in large, anonymous groups where individuals don't have ongoing trusting relationships.
Market Failure: The free rider problem means the private market cannot supply public goods like fire alarms or fireworks shows, even if society as a whole would benefit greatly. There's no mechanism for producers to recoup costs.
Government's Role in Providing Public Goods
Coercive Power: The government can overcome the free rider problem through its coercive power. Knowing that society values public goods ex post (after they're provided), the government can force contributions through taxation.
Example: Fireworks Shows: Towns across the US fund fireworks displays on July 4th by using tax revenue. Everyone pays a small mandatory amount (e.g., 10 per taxpayer per year, hypothetically), and everyone enjoys the fireworks, which otherwise wouldn't exist due to the free rider problem.
Other Examples: Schools, roads, and military service are other government-provided public goods. These services are collective benefits that would be underprovided or not provided at all by private markets.
Case Study: Military Service
Public Good Aspect: National defense (provided by the military) is a public good: it's non-excludable (everyone within the country benefits from secure borders) and largely non-rival (one person's safety doesn't diminish another's).
Free Rider in Military Service: Most citizens desire a secure border but do not want to serve in the military themselves, creating a classic free-rider problem.
Voluntary Military Service (US Model): The US employs a voluntary military, attracting recruits with payments and benefits (e.g., educational and health benefits). However, this can be regressive, disproportionately attracting individuals from lower-income backgrounds who see these benefits as a significant opportunity they might not otherwise have. Wealthier individuals with ample opportunities are, on average, less likely to enlist.
Draft System (Regulation Model):
Cost: Imposes a direct cost (service) on individuals, who have no choice.
Benefit: Ensures a broad, representative conscription. Critically, it makes the children of the wealthy and connected also vulnerable to the risks of war. This internalizes the externality for decision-makers; if their own families might serve, they may approach decisions about engaging in conflict differently.
Contrast: The current voluntary system in the US allows many citizens to free ride off the sacrifices of a specific segment of the population, often removed from the true costs of conflict. A draft system connects the decision to go to war more directly to its human costs for a wider population.
Common Resources and the Tragedy of the Commons
Common resources are not excludable (anyone can use them) but are rival (one person's use diminishes another's).
The Tragedy of the Commons
Definition: The tragedy of the commons is an economic problem in which every individual consumer of a shared resource acts independently and rationally according to their own self-interest, but contrary to the best interests of the entire group. This leads to the depletion or degradation of the common resource.
Classic Example: Grazing Land: Imagine an old English village with a communal green (a "commons") where shepherds graze their sheep. Anyone can bring their sheep there (non-excludable). However, if too many sheep graze, they eat all the grass, leaving none for others and ruining the pasture for everyone (rival). No individual shepherd has a private incentive to use the commons less; it's convenient and free. Each shepherd benefits more by grazing more sheep, but collectively, this overuse degrades the resource for all. Each individual thinks, "Someone else should reduce their usage, but I won't unless forced."
Other Examples: Overfishing off the coast of Rhode Island (fish populations can be decimated, affecting all fishers), overuse of forests, public swimming pools becoming unpleasantly crowded. Sustainable use of any natural resource is a challenge addressed by understanding the tragedy of the commons.
Externality: Each individual's use of the common resource imposes a small negative externality on others using it. Because these individual actions are not privately incentivized to be restrained, the resource is overused and eventually ruined for everyone. The problem lies in the combination of non-excludability and rivalry. This is an example of an externality problem that requires specific solutions, often involving regulation or property right assignments, to manage shared resources sustainably.