OCR A Level Economics: Economic efficiency and the nature of market failure (H460)

This guide follows the OCR A Level Economics (H460) specification, Version 3.0 (June 2026), for first assessment in 2021. It covers the topic Productive and allocative efficiency, and the topics Market failure and Externalities, all in Component 1, Microeconomics (H460/01). Nothing in the specification text is marked AS or Extension, so all of this is A Level content. All figures in worked examples are invented and illustrative.

Other market failures and government policy have their own pages. Start from the OCR Economics hub, the printable checklist and the Microeconomics overview. Next, use the revision notes, the practice questions and the free diagnostics.

What this unit covers

Specification topic	Outcomes
Productive and allocative efficiency	Explain productive, allocative and economic efficiency; distinguish static from dynamic; explain x-inefficiency; explain the conditions for productive and allocative efficiency; evaluate whether other market structures achieve them; evaluate the importance of productive, allocative and dynamic efficiency
Market failure	Explain market failure, its implications for efficiency, and over or under consumption and production and resource allocation
Externalities	Explain, with diagrams, external costs and benefits of consumption and production; explain MSC, MEC, MPC, MSB, MEB, MPB; explain why each of the four cases causes market failure; evaluate the effect on markets such as education, health, transport and the environment

Productive efficiency

A firm is productively efficient when it produces a given output at the lowest possible average cost. On the average cost (AC) diagram this is the lowest point of the AC curve, where marginal cost (MC) equals AC. For an economy, it means producing on the production possibility frontier rather than inside it.

Worked example. A tile firm in Country A (illustrative) has total cost TC = 48 + 12Q + 3Q², with Q in thousands of tiles and TC in £ thousand. Then AC = 48/Q + 12 + 3Q and MC = 12 + 6Q.

Q	TC	AC	MC
2	84	42.00	24
3	111	37.00	30
4	144	36.00	36
5	183	36.60	42
6	228	38.00	48

AC falls while MC is below it and rises once MC is above it. They meet at Q = 4, where AC = £36. The firm is productively efficient only at 4,000 tiles. At 5,000 tiles AC is £36.60, so it is not.

Allocative efficiency

A market is allocatively efficient when resources are put to the uses that society values most, so that the mix of output matches what consumers value at the margin. The condition is price equal to marginal cost (P = MC). Price shows the marginal benefit of the last unit to consumers and MC shows the cost of the resources used. If P > MC, consumers would pay more for another unit than it costs to make, so output is too low. If P < MC, output is too high. If there are external effects, the full test is marginal social benefit equal to marginal social cost (MSB = MSC).

Worked example. In a market in Country B (illustrative) demand is P = 44 − 2Q, so MR = 44 − 4Q. MC = 8 + 2Q. Price is in £ and Q in thousands.

1. Allocative efficiency, P = MC: 44 − 2Q = 8 + 2Q, so 4Q = 36 and Q = 9. Price = 44 − 18 = £26.
2. A profit-maximising monopolist sets MR = MC: 44 − 4Q = 8 + 2Q, so 6Q = 36 and Q = 6. Price = 44 − 12 = £32, and MC at 6 is 8 + 12 = £20.
3. At Q = 6 the price of £32 is £12 above MC. The triangle of lost welfare has base 9 − 6 = 3 and height 12. Area = ½ × 3 × 12 = £18 thousand.

Units 7 to 9 thousand are worth more than they cost, yet are not produced.

Economic efficiency, static and dynamic efficiency

Economic efficiency is the best use of scarce resources overall. In practice it needs productive and allocative efficiency together. Static efficiency is efficiency at one point in time, given the resources and technology available. Dynamic efficiency is efficiency over time, through investment, research and innovation that lower costs or create better products, so that cost curves shift down.

Worked example. A firm in Country C (illustrative) spends £450,000 on a new process. Unit cost falls from £20 to £17.50 on 120,000 units a year. Annual saving = 2.50 × 120,000 = £300,000. Payback = 450,000 ÷ 300,000 = 1.5 years.

The two can conflict. A firm with price power may charge above MC and be statically inefficient, yet use its profit to invest. A perfectly competitive firm may be statically efficient but earn only normal profit in the long run, leaving little to invest.

X-inefficiency

X-inefficiency exists when a firm produces at a higher cost than the lowest possible for its output, because there is little pressure to control cost. Its actual AC curve lies above the efficient one. Causes include weak competition, managers pursuing goals other than lowest cost, slack in workers’ effort and poor monitoring.

Worked example. A sheltered firm in Country D (illustrative) has unit cost £22. A firm of the same size facing competition has £18. Excess cost = 22 − 18 = £4 per unit, which is 4 ÷ 18 = 22.2% above the efficient level. At 50,000 units that is 4 × 50,000 = £200,000 of avoidable cost a year. If competition arrives and cost falls to £18, the firm moves from the higher AC curve to the lower one.

Conditions, and other market structures

Productive and allocative efficiency are most likely when:

• many firms compete, so no firm can set a price above MC
• there are no barriers to entry and exit, so supernormal profit is competed away
• firms are price takers and information is good
• there are no external costs or benefits, so MSC = MPC and MSB = MPB

Perfect competition. Each firm takes the price as given and produces where P = MC, so it is allocatively efficient. In the long run only normal profit remains, entry drives the price to the lowest point of AC, and it is productively efficient too. Using the tile firm, a long-run price of £36 gives Q = 4, AC = £36 and zero supernormal profit. In the short run at £42 it produces 5 (P = MC), is allocatively efficient, but AC is £36.60 and profit = (42 − 36.60) × 5 = £27 thousand. At £30 it produces 3, AC = £37 and the loss is £21 thousand.

Structure	Allocative	Productive	Reason
Perfect competition	Yes	Yes, long run only	Price taker; entry removes supernormal profit
Monopolistic competition	No	No in the long run	Downward-sloping demand puts P above MC; output stays below the lowest-AC level
Oligopoly	Usually not	Depends	Price above MC if collusion or differentiation; may gain scale economies
Monopoly	No	Often not	Restricts output to raise price; weak pressure on cost

Evaluation. Perfect competition is a benchmark rather than a description. Few real markets match it. A large firm may reach a lower AC through economies of scale than many small ones, so a monopoly can be productively more efficient than a fragmented market. A threat of entry in a contestable market can push even a large firm towards efficient prices. Dynamic gains from a profit-rich firm may outweigh static loss. The result depends on how large the price gap is and how the profits are used.

Importance of each type of efficiency

• Productive: lower cost means lower prices or higher profit and more output from the same resources. It matters most where resources are scarce or competitiveness depends on cost.
• Allocative: it ensures output matches wants. Failure shows up as waste: some goods are made in excess while others are scarce. It is harder to measure, because marginal benefit is not directly observed.
• Dynamic: over a long period it can matter more than small static gains, because it lifts productive capacity and living standards. But it is uncertain: investment may fail, and the benefits arrive late.

A fair judgement weighs the time horizon, and the three can conflict, as above.

Market failure

Market failure occurs when the free market, left alone, fails to allocate resources efficiently, so that MSB does not equal MSC. It can be partial, where the market exists but the quantity is wrong, or complete, where the market is missing.

Implications. The market is allocatively inefficient, causing a welfare loss. Where costs fall on others, a good tends to be over-produced and over-consumed. Where benefits spill to others, it tends to be under-produced and under-consumed. Resources are misallocated, with too many used for the first kind of good and too few for the second.

Externalities

An externality is a cost or benefit received by a third party outside the transaction and not reflected in the price. External costs are negative externalities. External benefits are positive externalities.

Term	Meaning
MPC	cost to the producer of one more unit
MEC	extra cost to third parties of one more unit
MSC	MPC + MEC
MPB	benefit to the consumer of one more unit (the demand curve)
MEB	extra benefit to third parties of one more unit
MSB	MPB + MEB

The market sets MPB = MPC. Society’s best output is where MSB = MSC. The gap between the two is the welfare loss.

1. Negative externality of production. MSC lies above MPC. Worked example: a factory in Country E (illustrative) has MPB = 50 − 2Q, MPC = 10 + 2Q and MEC = £8 per unit, so MSC = 18 + 2Q.

• Market: 50 − 2Q = 10 + 2Q gives Q = 10 and P = £30.
• Social optimum: 50 − 2Q = 18 + 2Q gives Q = 8 and P = £34.
• At Q = 10, MSC = 38 and MSB = 30, a gap of 8. Welfare loss = ½ × 2 × 8 = £8 thousand.

The market over-produces by 2 thousand units, because the producer ignores the external cost.

2. Negative externality of consumption. MSB lies below MPB, because each unit’s consumption harms others. The market over-consumes. Examples are noise and each driver adding to congestion.

3. Positive externality of consumption. MSB lies above MPB. Worked example: for a training course in Country F (illustrative), MPB = 90 − 4Q, MPC = MSC = 12 + 2Q and MEB = £12, so MSB = 102 − 4Q.

• Market: 90 − 4Q = 12 + 2Q gives Q = 13 and P = £38.
• Social optimum: 102 − 4Q = 12 + 2Q gives Q = 15 and P = £42.
• At Q = 13, MSB = 50 and MSC = 38, a gap of 12. Welfare gain from correction = ½ × 2 × 12 = £12 thousand.

The market under-consumes, because the buyer counts only private benefit.

4. Positive externality of production. MSC lies below MPC, because production benefits others, for example training that workers take to other firms. The market under-produces.

Case	Curve that differs	Market output compared with optimum
Negative, production	MSC above MPC	Too high
Negative, consumption	MSB below MPB	Too high
Positive, consumption	MSB above MPB	Too low
Positive, production	MSC below MPC	Too low

Each is market failure because prices reflect only private costs and benefits, so output differs from where MSB = MSC.

Effects on markets

• Education: a positive externality of consumption, because skills help employers and society. Under-consumption follows if individuals count only their own gain.
• Health: vaccination has a positive externality because it lowers infection risk for others. Smoking has a negative one, through harm to others.
• Transport: congestion and emissions are negative externalities of consumption. Each journey slows others.
• Environment: firm pollution is a negative externality of production.

Evaluation. The size of the gap matters more than its existence. External costs and benefits are hard to measure, so the optimum is uncertain. Some effects appear only in the long run. A small externality may not justify the expense of correcting it.

Common errors

• Stating P = MC for allocative efficiency when external effects exist. The test is then MSB = MSC.
• Saying productive efficiency is “lowest cost” without saying it is the lowest point of AC, where MC = AC.
• Placing MSC under MPC when the externality of production is negative.
• Treating monopoly as always productively and statically worse, without mentioning scale or dynamic gains.

Official syllabus

OCR, A Level Economics (H460), Version 3.0 (June 2026), for first assessment in 2021. Sections: Component 1 Microeconomics, topics Productive and allocative efficiency, Market failure and Externalities.