Market failure occurs when the free market’s allocation of goods and services imposes negative impacts on the environment. It applies when prices do not reflect the full environmental and social costs of production or consumption, encouraging pollution and resource overexploitation.
The Reasoning and Mechanism
This is HL-only content from HL.b Environmental economics. Producers and consumers usually respond to private costs and benefits, but their decisions can create environmental costs for third parties who were not involved in the transaction.
These unpriced effects are negative externalities. For example, a coal-fired power station pays for fuel, labour and equipment, but its market costs may exclude climate damage, air pollution and resulting healthcare costs. The market price of electricity is therefore lower than its full cost to society, so more may be consumed than is socially desirable.
| Cause of market failure | Environmental application |
|---|---|
| Negative externalities | Carbon emissions impose climate-related costs on other societies and future generations. |
| Missing market prices | Clean air, biodiversity and climate regulation may be damaged because they are not fully priced. |
| Poorly defined property rights | Open-access fisheries may be overexploited because no single user bears the full cost of stock depletion. |
| Incomplete information | Consumers may purchase products without knowing their full ecological footprint. |
The tragedy of the commons is therefore closely connected to market failure. Individuals gain a private benefit from exploiting a shared resource, while the environmental cost is distributed across all users.
Governments can apply the polluter-pays principle through environmental taxes, quotas or tradeable permits. The European Union Emissions Trading System, for example, places a price on greenhouse gas emissions. However, policy design involves perspectives and environmental justice: higher prices may disproportionately affect low-income households unless revenues support an equitable transition.
Exam Technique
For an ESS HL response, define market failure precisely, explain the gap between private and social costs, and apply it to a named environmental example. For evaluate or discuss, assess both the effectiveness and limitations of intervention, then give a supported conclusion.
