Market failure

What is Market Failure?

Market failure occurs when the free market, left to itself, fails to allocate resources efficiently — producing too much of some things, too little of others, or distributing goods in ways that are not socially optimal. It represents a breakdown of the price mechanism as an allocator of scarce resources.

Market failure arises in several situations:

• Externalities — costs or benefits that fall on third parties not involved in the transaction (explored in B1292).
• Public goods — goods that are non-excludable (cannot stop non-payers benefiting) and non-rival (one person's use does not reduce availability to others). Examples: street lighting, national defence. Markets underprovide public goods because firms cannot charge effectively for them.
• Information failure — buyers or sellers lack the information needed to make rational decisions. Example: consumers may not know a product is dangerous; patients may not fully understand medical advice.
• Monopoly power — a single dominant firm restricts output and raises prices above competitive levels, creating a misallocation of resources.

Costs of Misallocation

When markets fail, resources are misallocated — too much is spent on goods that cause harm (alcohol, tobacco, pollution-generating activities) or too little on goods that provide social benefit (education, healthcare, public transport). This creates:

• Welfare losses for consumers who cannot access goods at fair prices
• Environmental damage from goods produced without accounting for pollution costs
• Inequality, as markets distribute goods to those who can pay rather than those who need them most

Government Intervention

Governments intervene to correct market failures through:

• Taxation — taxing goods with negative externalities (tobacco, petrol, sugar) raises their price, reducing consumption towards the socially optimal level.
• Subsidies — subsidising goods with positive externalities (education, vaccinations) lowers their price, increasing consumption towards the optimal level.
• Regulation — setting legal standards and limits (pollution limits, minimum safety standards, banning certain products) to constrain harmful behaviour.
• Provision of public goods — government directly provides goods the market will not (national defence, street lighting).
• Information provision — campaigns to educate consumers (anti-smoking campaigns, food labelling requirements) to correct information failures.