Government Intervention to Address Market Failure (DP IB Economics)

Common Types of Intervention to Address Market Failure

Methods used to address market failure

1. Indirect (Pigouvian) taxes
   A Pigouvian tax is a tax placed on a product with harmful side effects (named after Arthur Pigou), so as to increase its price and reduce the quantity demanded or the supply. Useful to address market failure where goods are over-provided
    

2. Carbon taxes
   A tax that producers who emit greenhouse gases have to pay. It sets a price on the carbon content forcing producers to pay for each ton of emissions. This raises their costs of production and should reduce supply. Useful to address market failure in markets where there's high a carbon footprint
   

3. Producer subsidies
   The government gives firms a fixed amount of money per unit produced in order to lower production costs and/or increase output of the product. Useful to address market failure where goods are under-provided or consumed
   

4. Legislation and regulation
   The government creates new laws (e.g. no single-use plastic bags) and then creates an agency (e.g. environment agency) to regulate those laws. Useful to address market failure where goods are over-provided or consumed
   

5. Education
   The government funds advertising and education programs to educate the public on the dangers (or sometimes the benefits) of certain products e.g. anti smoking campaigns. Useful to address market failure caused by the existence of merit and demerit goods
   

6. Tradable permits
   A mechanism which provides firms who emit greenhouse gases the option to buy a permit to pollute when it is required. This increases their costs of production and should reduce supply. If firms have permits that are no longer needed they are able to sell them to other firms
   

7. International agreements
   These are useful for issues which are global in nature and require a globally coordinated response e.g. COP 27 agreements on climate change. Useful to address market failure where the tragedy of the commons is occurring and the global trade in demerit goods
   

8. Collective self-governance
   Occurs when communities come together to take control of common pool resources in an attempt to deal with the negative externalities associated with their use
   

9. Government provision
   Governments will often choose to directly provide certain goods/services (merit goods) in order to ensure that everyone in society has the same access. Useful to address market failure where goods are under-provided

Indirect (Pigouvian) Taxes

• A Pigouvian tax is a tax placed on a product with harmful side effects (named after Arthur Pigou), so as to increase its price and reduce the quantity demanded or the supply

• The aim of this tax is to make the individual or firm causing the externality to pay for it - the so-called polluter pays principle

• An indirect tax can be either ad valorem or specific
    

1. Specific Tax on a Negative Externality of Production

• Governments frequently tax firms that pollute or create external costs in production
   

A diagram that shows the impact of a tax on a product that is over-provided in society. The tax reduces the welfare loss and moves production closer to the optimum level of production

Diagram Analysis

• The free-market equilibrium is at P_eQ_e - where MSB = MPC

  • Market failure exists as MSC > MSB at equilibrium

  • Optimum level of output is at Q_opt

  • There is over-provision of this product equal to Q_e - Q_opt
     

• A specific tax shifts the supply curve left from S → S₁ as it increases the costs of production

  • The tax does not completely eradicate the welfare loss but moves the market closer to the optimum level of output (Q_opt)

  • The welfare loss has been reduced as shown in the diagram
     

• The new market equilibrium is at P₁Q₁

  • This is a higher price and less output

  • There is less over-provision and so less market failure

  • The external costs have been reduced
     

2. Specific Tax on a Negative Externality of Consumption

• Governments frequently tax demerit goods such as cigarettes, alcohol, fatty foods, and polluting vehicles

A diagram that shows the impact of a tax on a product that is over-consumed in society. The tax reduces the welfare loss and moves consumption closer to the optimum level of production

Diagram Analysis

• The free-market equilibrium is at P_eQ_e where MPB = MSC

  • Market failure exists as MSC > MSB at equilibrium

  • The optimum level of consumption is at Q_opt

  • There is over-consumption of this product equal to Q_e - Q_opt
     

• A specific tax shifts the supply curve left from S → S₁ as it increases the costs of production

  • The tax does not completely eradicate the welfare loss but moves the market closer to the optimum level of output (Q_opt)

  • The welfare loss has been reduced as shown in the diagram
     

• The new market equilibrium is at P₁Q₁

  • This is a higher price and lower output

  • There is less over-consumption and so less market failure

  • The external costs have been reduced and the market is closer to the socially optimum level of output Q_opt

Evaluating the use of Indirect Taxes to Address Market Failure

The Advantages & Disadvantages of Indirect Taxes

Carbon Taxes

• A carbon tax is a tax on producers who emit greenhouse gases

• The tax sets a price on the carbon content forcing producers to pay for each ton of carbon dioxide (CO₂) emissions

• The tax raises their costs of production and should reduce the supply

• This tax is useful in addressing market failure associated with atmospheric pollution
    

Canada has the highest carbon tax rates per ton of CO₂ emissions in the world. The tax ranges from $15-$38 per ton of CO₂ released - and is levied on all fossil fuels

Diagram Analysis

• The free-market equilibrium is at P₁Q₁  where MSB = MPC

  • Market failure exists as MSC > MSB at equilibrium

  • The optimum level of output is at Q_opt

  • There is over-provision of this product equal to Q₁ - Q_opt
     

• The carbon tax raises the cost of production for producers

  • This causes the supply curve to shift left from S → S₁, reducing the level of supply

  • The tax does not completely eradicate the welfare loss but moves the market closer to the optimum level of output (Q_opt)

  • The welfare loss to society has been reduced 
     

• The new market equilibrium is at P₂Q₂

  • This is a higher price and lower output

  • There is less over-provision and so less market failure

  • The external costs have been reduced

Evaluating the use of Carbon Taxes to Address Market Failure

The Advantages and Disadvantages of Carbon Taxes

Subsidies

• Governments frequently use subsidies to encourage production/consumption of merit goods such as energy-efficient products, electric vehicles, healthcare, and education

A diagram that shows the impact of a subsidy on a product that is under-consumed in society. The subsidy reduces the welfare loss and moves consumption closer to the optimum level 

Diagram Analysis

• The free-market equilibrium is at P_eQ_e  where MPB = MSC

  • Market failure exists as MSB > MSC at equilibrium

  • The optimum level of output is at Q_opt

  • There is under-consumption of this product equal to Q_opt - Q_e
     

• A subsidy shifts the supply curve right from S → S₁ as it lowers the costs of production

  • It does not completely eradicate the potential welfare gain but moves the market closer to the optimum level of output (Q_opt)

  • The welfare loss has been reduced as shown in the diagram
     

• The new market equilibrium is at P₁Q₁

  • This is a lower price and higher output

  • There is less under-consumption and so less market failure

  • Some of the external benefits available have been realised

Evaluating the use of Subsidies to Address Market Failure

The Advantages and Disadvantages of Producer Subsidies

Legislation & Regulation

• Governments create laws (legislation) to limit the harm caused by the external costs of consumption or production

• Regulatory agencies are then created to enforce the law and monitor that they are not broken

  • Examples of regulators in the USA include The Environment Agency, The Food and Drug Administration (FDA), and The State Bank Regulators
     

• Legislation can aim to influence the consumer side of the market (demand) or the producer side (supply) or both

1. Legislation aimed at the consumer side

• The legal age for drinking alcohol in the USA is 21 while it is only 18 in the UK

• The UK Government could change the legal age of alcohol consumption in order to reduce demand and the external costs associated with excessive alcohol consumption

Legislation that changes the legal age of alcohol consumption will reduce the demand for alcohol thus decreasing the external costs of excessive drinking

Diagram Analysis

• The free-market equilibrium is at P₁Q₁  where MPB = MSC

  • Market failure exists as MSC > MSB at equilibrium

  • The optimum level of consumption is at Q_opt

  • There is over-consumption of this product equal to Q₁ - Q_opt
     

• The introduction of legislation that changes the legal age for alcohol consumption from 18 to 21 shifts the demand curve left from D → D₁ as it reduces the effective population able to consume alcohol

  • The legislation does not completely eradicate the welfare loss but moves the market closer to the optimum level of output (Q_opt)

  • The welfare loss has been reduced
     

• The new market equilibrium is at P₂Q₂

  • This is a lower price and lower output

  • There is less over-consumption and so less market failure

  • The external costs have been reduced and the market is closer to the socially optimum level of output Q_opt

2. Legislation aimed at the producer side

• Crayfish have been overfished off the coast of New Zealand (NZ)

• The NZ Minister of Fisheries (the regulator) is planning on closing certain crayfishing areas for a period of three years in order to allow the external costs (possible extinction in some areas) to be reduced

Legislation that reduces the potential supply of crayfish will help alleviate the external costs of overfishing

Diagram Analysis

• The free-market equilibrium is at P₁Q₁ where MSB = MPC

  • Market failure exists as MSC > MSB at equilibrium

  • The optimum level of supply is at Q_opt

  • There is over-supply of this product equal to Q₁ - Q_opt
     

• The introduction of legislation which stops crayfish from being caught in certain areas for 3 years will shift the entire supply curve left from S → S₁

  • The legislation does not completely eradicate the welfare loss but moves the market closer to the optimum level of output (Q_opt)

  • The welfare loss has been reduced
     

• The new market equilibrium is at P₂Q₂

  • This is a higher price and lower output

  • There is less over-supply and so less market failure

  • The external costs have been reduced and the market is closer to the socially optimum level of output Q_opt

Evaluating the use of Legislation & Regulation to Address Market Failure

The Advantages and Disadvantages of Legislation and Regulation

Education

• Raising awareness of the external benefits or costs associated with the consumption of a good/service is an effective long-term method of changing consumer behaviour

• Education campaigns happen in many different ways including social media advertising, television, newspaper and radio advertising, provision of brochures at Government-owned buildings (e.g. libraries)

1. Educating consumers on the benefits of merit goods

• Educating consumers on the benefits of merit goods will increase consumption of goods with external benefits (e.g. electric cars, energy-efficient heating systems)

Educating consumers on the external benefits of electric cars will increase their marginal private benefit and demand will increase

Diagram Analysis

• The free-market equilibrium is at P_eQ_e  where MPB = MSC

  • Market failure exists as MSB > MSC at equilibrium

  • The optimum level of consumption is at Q_opt

  • There is under-consumption of electric cars equal to Q_e - Q_opt
     

• The introduction of an education campaign which promotes the external benefits of using electric cars (less CO₂ pollution) shifts the demand curve right from D → D₁ as consumers want to act positively towards emissions levels and climate change

  • The education does not completely eradicate the welfare loss but moves the market closer to the optimum level of output (Q_opt)

  • The welfare loss has been reduced
     

• The new market equilibrium is at P₁Q₁

  • This is a higher price and output

  • There is less under-consumption and so less market failure

  • The external benefits have been recognised and the market is closer to the socially optimum level of output Q_opt

2. Educating consumers on the dangers of consuming demerit goods

• Educating consumers on the dangers of consuming demerit goods will decrease the consumption of goods with external costs (e.g. cigarettes, alcohol, drugs, single-use plastics)

• Demerit goods are usually addictive but even small decreases in consumption are still worthwhile

Educating consumers on the external costs of demerit goods will decrease their marginal private benefit and demand will decrease
 

Diagram Analysis

• The free-market equilibrium is at P_eQ_e  where MPB = MSC

  • Market failure exists as MSC > MSB at equilibrium

  • The optimum level of consumption is at Q_opt

  • There is over-consumption of cigarettes equal to Q_e - Q_opt
     

• The introduction of an education campaign which raises awareness of the external costs of smoking (e.g. passive smoking, cigarette stump pollution) shifts the demand curve left from D → D₁ as consumers weigh their actions more carefully

  • The education does not completely eradicate the welfare loss but moves the market closer to the optimum level of output (Q_opt)

  • The welfare loss has been reduced
     

• The new market equilibrium is at P₁Q₁

  • This is a higher price and output

  • There is less under-consumption and so less market failure

  • The external benefits have been recognised and the market is closer to the socially optimum level of output Q_opt

Evaluating the use of Education to Address Market Failure

The Advantages and Disadvantages of using Education