Government intervention

What you'll learn

• Why governments intervene when markets do not produce socially desirable outcomes.
• How taxes, subsidies, price controls, buffer stocks, permits, regulation and competition policy work.
• How to evaluate whether intervention improves welfare or creates government failure.
• How to build balanced OCR H460 essay arguments using diagrams, examples and judgement.

1. The starting point: markets and welfare

A market equilibrium is where demand equals supply, giving an equilibrium price and quantity. In a simple competitive market, this can allocate resources efficiently because consumers and producers respond to price signals.

But markets do not always maximise social welfare, meaning the overall wellbeing of society. For example, pollution creates costs for people not involved in the transaction, and firms with monopoly power may restrict output and raise prices.

2. Taxation and subsidies

Taxation

Taxation is money collected by the government from households or firms. In market diagrams, the most common type is an indirect tax, which is placed on spending or production. A specific tax is a fixed amount per unit, while an ad valorem tax is a percentage of price, such as VAT.

An indirect tax increases firms’ costs, so the supply curve shifts upwards. The market price paid by consumers rises, the price received by producers falls, and quantity traded decreases. This can reduce consumption of demerit goods, such as cigarettes, alcohol or high-sugar products.

If a tax is designed to correct a negative externality, it is often called a Pigouvian tax, after economist Arthur Pigou. The idea is to make consumers or producers “internalise” the external cost.

Subsidies

A subsidy is a payment from the government to producers or consumers to encourage production or consumption. A producer subsidy lowers firms’ costs, shifting supply downwards. This usually lowers the consumer price, raises the producer price received, and increases quantity.

Subsidies may support merit goods, such as education, public transport or green technologies, where the free market may under-consume because private decision-makers ignore wider social benefits.

The tax and subsidy diagrams show how intervention changes prices, output and welfare areas. A deadweight welfare loss is welfare lost to society that is not gained by another group.

3. Price controls and buffer stock systems

Price controls

Price controls are legal limits on prices.

A maximum price, or price ceiling, is a legal price set below the market equilibrium. It is intended to make a good more affordable, such as rent controls on housing. However, if it is binding, quantity demanded exceeds quantity supplied, causing a shortage.

A minimum price, or price floor, is a legal price set above the market equilibrium. It is intended to protect incomes or standards, such as minimum wages in labour markets. However, if it is binding, quantity supplied exceeds quantity demanded, causing a surplus.

Buffer stock systems

A buffer stock system is a scheme where the government buys and sells stocks of a commodity to stabilise its price. It is most relevant for agricultural goods, where supply can fluctuate due to weather and harvest conditions.

When price falls below a lower intervention price, the government buys surplus output, increasing demand and supporting the price. When price rises above an upper intervention price, the government releases stored stock, increasing supply and reducing the price.

Buffer stocks can stabilise farmer incomes and protect consumers from sharp price rises. But they can be expensive, require storage, and may fail if the target price is set unrealistically high. They work best for goods that are storable and have predictable demand.

4. Spending, partnerships, laws and regulation

Government expenditure

Government expenditure is public-sector spending on goods, services and investment. It may involve direct provision of public goods such as street lighting, flood defences and national defence. A public good is non-rival and non-excludable, meaning one person’s use does not reduce another’s, and non-payers cannot easily be excluded.

Spending can also support merit goods like healthcare and education. In macroeconomics, government spending can increase aggregate demand, while infrastructure investment can improve long-run productive capacity.

The downside is opportunity cost: money spent on one policy cannot be spent elsewhere. Higher spending may also require taxation or borrowing.

Public/private partnerships

A public/private partnership, often called a PPP, is cooperation between government and private firms to finance, build or operate a service or project. For example, private firms might build a hospital or road under a long-term contract.

PPPs can bring private-sector expertise and reduce short-term pressure on public finances. However, contracts can be complex, profit motives may conflict with service quality, and taxpayers may face long-term liabilities.

Legislation and regulation

Legislation means laws passed by government. Examples include bans, age restrictions, safety standards and environmental laws.

Regulation means rules and monitoring, often enforced by bodies such as the Competition and Markets Authority, Ofgem or the Financial Conduct Authority. Regulation can set quality standards, limit emissions, control prices, or require firms to provide accurate information.

Rules can be powerful because they directly restrict behaviour. However, they may raise firms’ compliance costs and can create government failure if regulators lack information or are captured by the industry.

Information provision

Information provision means the government supplies information to help consumers and firms make better decisions. Examples include food labelling, public health campaigns, energy-efficiency ratings and comparison websites.

This can correct information failure, where buyers or sellers lack accurate knowledge. It is relatively low-cost and preserves consumer choice, but it may be weak if consumers ignore advice, face addiction, or lack time to process information.

Competition policy

Competition policy is government action to promote competition and prevent firms from abusing market power. In the UK, the Competition and Markets Authority can investigate mergers, cartels, collusion and abuse of dominance.

The aim is to lower prices, improve quality and increase innovation. However, competition investigations can be slow and difficult, especially in digital markets where firms operate globally and data creates strong barriers to entry.

5. Tradable pollution permits

Tradable pollution permits are a market-based environmental policy. The government sets a cap on total pollution, issues permits, and allows firms to buy and sell them. This is sometimes called cap and trade.

Firms that can cut emissions cheaply will do so and sell spare permits. Firms that find it expensive to reduce emissions may buy permits. This means the emissions reduction should happen where it is cheapest, improving cost efficiency.

A UK example is the UK Emissions Trading Scheme, which applies to energy-intensive industries and power generation. The policy gives firms a financial incentive to reduce carbon emissions, especially when permit prices are high.

Possible weaknesses include inaccurate caps, volatile permit prices, monitoring problems, and carbon leakage, where production shifts to countries with weaker environmental rules.

6. Government failure

Common causes include:

• Imperfect information: governments may not know the true external cost, demand conditions or likely behavioural response.
• Administrative costs: designing, enforcing and monitoring a policy can be expensive.
• Unintended consequences: rent controls may reduce housing supply; subsidies may support inefficient firms.
• Regulatory capture: regulators may act in the interests of the firms they regulate rather than consumers.
• Political incentives: governments may choose popular short-term policies before elections, even if long-term effects are poor.
• Time lags: by the time intervention works, market conditions may have changed.
• Moral hazard: if firms expect rescue, they may take excessive risks.

Consequences can include deadweight welfare loss, shortages, surpluses, black markets, wasted tax revenue, reduced investment, lower innovation and unfair distributional effects.

7. Evaluating the effectiveness of intervention

To evaluate effectiveness, ask: did the policy achieve its objective, and were the benefits greater than the costs?

A strong judgement considers:

• The cause of the problem: taxation may suit negative externalities; competition policy suits monopoly power; information provision suits information failure.
• Elasticities: price-based policies work better at changing quantity when demand or supply is responsive.
• Time period: short-run results may differ from long-run incentives.
• Stakeholders: consumers, producers, workers, taxpayers and future generations may be affected differently.
• Administrative feasibility: policies requiring detailed monitoring may be costly.
• Equity: taxes on necessities may be regressive, hitting lower-income households harder.
• Opportunity cost: subsidies and spending require funding.
• Government-failure risk: poor targeting or political pressure can reduce welfare.