IB DP Economics - Unit 2 - Main forms of government intervention in markets-Study Notes - New Syllabus

Main Forms of Government Intervention in Markets

1. Price Controls: Price Ceilings and Price Floors

Price controls are legal restrictions set by the government on prices to influence market outcomes.

Price ceiling (maximum price):

Definition: A legally imposed maximum price that can be charged for a good or service.

• Usually set below equilibrium price.
• Aims to make goods more affordable for consumers.
• Leads to excess demand (shortage).

Effects price ceilings have on surplus:

Price floor (minimum price):

Definition: A legally imposed minimum price that must be paid for a good or service.

• Usually set above equilibrium price.
• Aims to protect producers’ income.
• Leads to excess supply (surplus).

Effects price floors have on surplus:

Calculation (HL ONLY): Effects price ceilings/floors have on surplus:

Calculate the areas of the triangles after the ceiling/floor $\mathrm{(\frac{1}{2}×Base×Height)}$ and compare with the areas before the ceiling/floor.

2. Indirect Taxes and Subsidies

Governments use taxes and subsidies to influence market outcomes.

Indirect tax:

Definition: A tax imposed on goods and services rather than on income (e.g. VAT).

• Increases the cost of production for firms.
• Shifts the supply curve left.
• Leads to higher prices and lower quantity traded.

Effects indirect taxes have on surplus:

Subsidy:

Definition: A payment from the government to producers to reduce production costs.

• Lowers the cost of production.
• Shifts the supply curve right.
• Leads to lower prices and higher quantity traded.

Effects indirect taxes have on surplus:

3. Direct Provision of Services

Governments may directly provide certain goods and services instead of leaving them to the market.

• Provision of public goods (e.g. national defence, street lighting).
• Provision of merit goods (e.g. education, healthcare).
• Services are often provided free or at subsidised prices.

Economic Explanation:

• Public goods are non-excludable and non-rival, so private firms may not supply them.
• Merit goods are often underconsumed in a free market.
• Government provision ensures adequate supply and improves social welfare.

Market underprovides → Government supplies

4. Command and Control Regulation and Legislation

Governments use laws and regulations to directly control economic activity.

• Laws to restrict or ban harmful activities (e.g. pollution limits, safety standards).
• Regulations to control production methods and quality.
• Penalties and fines for non-compliance.

Economic Explanation:

• Used to correct market failure, especially negative externalities.
• Ensures firms consider social costs of production.
• Directly influences behaviour without relying on price mechanisms.

Regulation → Controlled behaviour → Reduced harm

Evaluation Insight :

• Direct provision ensures access but may be costly and inefficient.
• Regulation is effective but may increase compliance costs for firms.
• Excessive intervention may lead to government failure.

Key Point:

• Direct provision addresses public goods and merit goods.
• Regulation controls harmful economic activities.
• Both aim to improve social welfare and efficiency.
• Governments use a mix of policies for effective intervention.