Edexcel International A Level Economics
Edexcel International A Level Economics Market Failure Exam Questions
Free Edexcel International A Level Economics exam questions for Market Failure, with a mark scheme for every pack. Covers types of market failure, positive and negative externalities, public goods, the free rider problem and information gaps.
Market Failure exam questions
1 question pack of real past exam questions, each with its mark scheme. Do not stop after a few: answer as many as you can without notes, then mark every answer with the mark scheme. The more questions you do, the more quickly you will spot how examiners ask about each idea.
About Edexcel International A Level Economics Market Failure
Market failure is a key Unit 1 topic in Edexcel International A Level Economics. It explains why the free market does not always allocate resources efficiently and so provides the reason for government intervention. You learn about externalities in production and consumption, public goods and the free rider problem, and information gaps between buyers and sellers. You need to analyse each type with clear diagrams showing marginal private and social costs and benefits and the welfare loss. Market failure leads directly into the next topic, government intervention, and the ideas are applied again in Unit 4 when you study environmental issues and financial markets.
What you need to know
- Definition Market failure occurs when the free market leads to a misallocation of resources, so the outcome is not socially optimal. Failure can be complete (a missing market) or partial.
- Externalities An externality is a cost or benefit to a third party. Social cost = private cost + external cost; social benefit = private benefit + external benefit. Negative externalities lead to overproduction and positive externalities lead to underconsumption.
- Externality diagrams For a negative production externality MSC lies above MPC; the market output is where MPC = MPB, above the social optimum where MSC = MSB. The welfare loss triangle lies between the two outputs.
- Public goods Public goods are non-rival and non-excludable, for example street lighting and flood defences. The free rider problem means firms cannot charge, so they are underprovided or not provided at all.
- Information gaps When buyers or sellers lack full information, resources are misallocated. Asymmetric information, as in second-hand cars or insurance, can lead to adverse selection and moral hazard.
Common mistakes in Market Failure
- Labelling the welfare loss area wrongly. The triangle is bounded by MSC and MSB between the market quantity and the socially optimal quantity.
- Saying a positive externality leads to overproduction. Positive externalities lead to underproduction or underconsumption, because private benefits are lower than social benefits.
- Calling healthcare a public good. It is rival and excludable, so it is not a public good, although it has positive externalities.
- Writing 'third parties' without saying who they are. Name them, for example residents near a factory who suffer air pollution.
- Confusing non-rival and non-excludable. Non-rival means one person's use does not reduce availability to others; non-excludable means non-payers cannot be prevented from using it.
Try three Market Failure exam-style questions
1. Define the term 'externality'. (2 marks)
Show the mark scheme answer
A cost or benefit; experienced by a third party who is not directly involved in the transaction.
2. With the help of a diagram, explain why the free market overproduces goods with negative production externalities. (6 marks)
Show the mark scheme answer
Firms consider only private costs; MSC lies above MPC by the external cost; market output is where MPC = MPB (or demand); social optimum is where MSC = MSB at a lower output; market output exceeds the optimum; welfare loss triangle shown; diagram correctly labelled.
3. Explain how asymmetric information can lead to market failure in the market for used cars. (4 marks)
Show the mark scheme answer
Sellers know more about the quality of the car than buyers; buyers cannot tell good cars from bad, so they offer an average price; sellers of good cars withdraw; the market is dominated by poor quality cars (adverse selection); resources are misallocated.
Market Failure FAQs
What does Edexcel IAL Economics Market failure cover?
It covers the meaning of market failure, positive and negative externalities, public goods and the free rider problem, and information gaps.
Which unit is Market failure examined in?
It is part of Unit 1, Markets in action and leads directly into government intervention in markets.
How do I draw a positive consumption externality diagram?
Draw MSB above MPB, with MPC = MSC as the supply curve. Market output is where MPB meets MPC, which is below the optimum where MSB meets MSC, with the welfare loss triangle between the two outputs.
