Market Failures
Analyze externalities, public goods, information asymmetry, inequality, and policy responses such as taxes, subsidies, and regulation.
A lesson of Economics, in Microeconomics, about 10 minutes.
By the end of this lesson, you will be able to identify the four types of market failure, explain why markets fail to allocate resources efficiently in these cases, and describe the role of government in addressing them.
What Is Market Failure?
Market failure occurs when the free market does not allocate resources efficiently — producing either too much or too little of a good, or failing to provide it at all.
Markets work well when:
- All costs and benefits fall on the buyer and seller
- There is competition
- Property rights are well-defined
- Information is complete
When these conditions break down, market failure can occur.
1. Externalities
Externality: a cost or benefit of a transaction that falls on third parties not involved in the exchange.
Negative externality (external cost): pollution is the classic example. A factory produces steel and emits pollution. The market price reflects the factory's costs but not the health costs borne by people downwind.
Result: overproduction relative to the social optimum. The market produces more than is socially efficient.
Government remedies: taxes (Pigouvian tax = tax equal to the external cost); cap-and-trade systems; regulations.
Positive externality (external benefit): education generates benefits for all of society (better informed citizens, lower crime, higher productivity) beyond the benefits to the individual.
Result: underproduction relative to the social optimum.
Government remedies: subsidies (e.g., public education, subsidized vaccines); direct public provision.
2. Public Goods
Public good: non-rival (one person's use doesn't reduce availability for others) AND non-excludable (can't prevent people from using it).
Examples: national defense, public fireworks, clean air, free-to-air TV broadcasts.
The free-rider problem: since you can't exclude anyone, people have no incentive to pay voluntarily. If the market provides it, everyone free-rides.
Result: private markets won't provide public goods (or will underprovide them).
Government solution: direct provision funded by taxation (national defense, public roads, basic research).
3. Imperfect Information
Adverse selection: one party to a transaction has better information than the other before the transaction.