Government Intervention

Government Intervention in Markets

When markets fail to allocate resources efficiently, governments may intervene to improve outcomes. However, intervention carries risks of government failure, making the evaluation of policy a central skill at A-Level.

Indirect Taxes

An indirect tax is a tax on spending (placed on producers but partly passed to consumers through higher prices).

Types

• Specific tax: fixed amount per unit (e.g., fuel duty of 52.95p per litre)
• Ad valorem tax: percentage of price (e.g., VAT at 20%)

Diagram (Specific Tax)

• Supply curve shifts vertically upward by the tax amount
• New equilibrium: higher price (P2), lower quantity (Q2)
• Consumer burden: P2 - P1 (price rise paid by consumers)
• Producer burden: P1 - (P2 - tax) (price fall received by producers after tax)
• Tax revenue: tax per unit × Q2

Incidence of Tax

The burden of tax depends on relative elasticities:

• Inelastic demand + elastic supply: consumers bear most of the tax (e.g., cigarettes, petrol)
• Elastic demand + inelastic supply: producers bear most of the tax
• This is why governments tax goods with inelastic demand — revenue is higher and consumption falls less

Evaluation

• Strengths: internalises external costs (Pigovian tax — Pigou), raises revenue, discourages demerit goods
• Weaknesses: regressive (takes a larger proportion of income from the poor), difficult to set the correct rate (requires knowledge of the external cost), may encourage black markets (cigarette smuggling), may reduce competitiveness if applied domestically but not to imports

Subsidies

A subsidy is a payment by the government to producers to reduce costs and encourage production/consumption.

Diagram

• Supply curve shifts vertically downward by the subsidy amount
• New equilibrium: lower price, higher quantity
• Cost to government = subsidy per unit × quantity

Evaluation

• Strengths: corrects positive externalities (education, renewable energy), increases output towards socially optimal level, can target specific groups (first-time buyers)
• Weaknesses: opportunity cost of government spending, may lead to over-production if set too high, may benefit producers more than consumers (depends on elasticities), can be difficult to remove once established (political pressure from recipients), risk of government failure in picking winners (Concorde, various green energy subsidies)

Maximum Prices (Price Ceilings)

A maximum price is set below the equilibrium to make goods affordable.

Examples: rent controls, price caps on energy bills, maximum prices on essential food during crises.

Effects

• Creates excess demand (shortage): Qd > Qs
• Consumers who can buy benefit from lower prices
• But quantity supplied falls, leading to:
• Rationing by non-price mechanisms (queues, waiting lists, favouritism)
• Black markets at higher prices
• Reduced quality (landlords underinvest in maintenance under rent controls)
• Allocative inefficiency: P < MC

Evaluation

• Helps low-income consumers in the short run
• But long-run supply response worsens shortages
• Rent controls: widely studied. Assar Lindbeck: "rent control is the most efficient technique presently known to destroy a city — except for bombing"
• Swedish economist's hyperbole, but evidence does show reduced housing supply and mobility

Minimum Prices (Price Floors)

A minimum price is set above the equilibrium, below which the good cannot legally be sold.

Examples: minimum wage, EU Common Agricultural Policy (CAP), minimum unit pricing for alcohol (Scotland, 2018).

Effects

• Creates excess supply: Qs > Qd
• In labour markets: minimum wage above equilibrium creates unemployment (classical view)
• In agricultural markets: government may have to buy and store surplus (CAP butter mountains)

Evaluation

• Protects producers' incomes (farmers, low-paid workers)
• In monopsony labour markets, minimum wage can increase employment and wages (Card & Krueger)
• May reduce consumption of demerit goods (alcohol minimum pricing reduced alcohol-related hospitalisations in Scotland — Sheffield Alcohol Research Group)
• But can create waste, surpluses, and inefficiency

Tradable Pollution Permits (Cap and Trade)

How It Works

1. Government sets a total emissions cap

2. Permits are allocated (or auctioned) to firms

3. Firms that can reduce pollution cheaply sell surplus permits

4. Firms that find reduction expensive buy permits

5. The cap can be tightened over time to reduce total emissions

Example: EU Emissions Trading System (EU ETS) — the world's largest carbon market.

Evaluation

• Strengths: uses the price mechanism (market-based), ensures environmental target is met (quantity certainty), rewards clean firms, encourages innovation in green technology
• Weaknesses: initial allocation may be generous (windfall profits if given free), price volatility can undermine investment signals, monitoring and enforcement are costly, may not cover all polluters, permits may be too cheap to incentivise change (EU ETS prices were very low until 2018 reforms)

Regulation and Legislation

Direct rules imposed by government on economic activity.

Examples:

• Pollution standards (emission limits)
• Health and safety regulations
• Competition law (preventing mergers, banning cartels)
• Planning regulations (land use)
• Financial regulation (capital requirements for banks)

Evaluation

• Strengths: clear and enforceable, can address market failures directly, protects consumers and workers
• Weaknesses: compliance costs (especially for small firms), may stifle innovation, risk of regulatory capture (firms influence regulators), difficult to set optimal standards without perfect information, can create barriers to entry

Provision of Public Goods and Information

The government directly provides goods the market would undersupply:

• Public goods: defence, policing, street lighting (non-excludable, non-rivalrous)
• Merit goods: education, healthcare (NHS)
• Information: public health campaigns (anti-smoking), mandatory labelling, financial literacy programmes

Evaluation

• Corrects market failure from public goods and information asymmetries
• But funded through taxation (deadweight loss of taxation, administrative costs)
• Government may be paternalistic — deciding what people should consume
• X-inefficiency may arise in state-provided services (no competitive pressure)

Property Rights and the Coase Theorem

Coase Theorem (Ronald Coase, 1960): if property rights are clearly defined and transaction costs are zero, private bargaining will lead to an efficient outcome regardless of the initial allocation of rights.

Example: if a factory pollutes a river, either:

• The factory has the right to pollute → fishermen pay the factory to reduce pollution
• Fishermen have the right to clean water → the factory pays compensation or installs filters

Evaluation:

• Elegant theoretical solution that avoids government intervention
• But transaction costs are rarely zero in practice
• Free-rider problem makes collective bargaining difficult
• Property rights are often unclear or hard to enforce (air pollution, ocean pollution)
• Works best for small-scale, localised externalities

Government Failure — Key Evaluation Framework

Every intervention question should be evaluated against the risk of government failure:

Risk	Example
Information failure	Setting the "correct" tax/subsidy level requires precise knowledge of externalities
Unintended consequences	Rent controls causing housing shortages
Administrative costs	Bureaucracy of regulation outweighs benefits
Distortion of incentives	Subsidies encouraging dependency rather than innovation
Political influence	Policies chosen to win votes rather than maximise welfare
Regulatory capture	Regulators acting in the interest of firms rather than consumers

Exam Technique

• Always draw a before and after diagram for taxes, subsidies, and price controls
• For 25-mark essays: evaluate at least two types of intervention, comparing their effectiveness for the specific market failure
• Use the government failure framework as your counter-argument
• Apply to real-world examples (UK sugar tax, EU ETS, NHS, rent controls, minimum wage)
• Consider short run vs long run effects of intervention