OCR A Level Economics: Opportunity cost, the PPF, specialisation and trade (H460)

This guide follows the OCR A Level Economics (H460) specification, Version 3.0 (June 2026), for first assessment in 2021. It covers two topics in Component 1, Microeconomics: Opportunity cost (area of study Scarcity and choice) and Specialisation and trade. The whole specification is A Level and the text labels no content as AS or Extension. Every figure below is invented and illustrative.

Comparative advantage and the terms of trade between countries belong to the international trade topic, not here. Use the OCR Economics hub, the printable checklist and the free diagnostics to plan your revision.

What this unit covers

Topic	You must be able to
Opportunity cost	Explain opportunity cost and a trade-off; explain a production possibility curve/frontier (PPC/F); explain what shifts it; use it to illustrate scarcity, choice, opportunity cost and productive efficiency; evaluate the usefulness of opportunity cost
Specialisation and trade	Explain specialisation and the division of labour; evaluate their role in addressing scarcity; explain how specialisation encourages trade and exchange; explain how money facilitates trade compared with barter

1. Opportunity cost and trade-offs

Opportunity cost is what a decision-maker loses by choosing one option: the value of the single most valuable alternative passed over. It is that one forgone option, not the whole list.

A trade-off is the situation in which getting more of one thing means accepting less of another. The trade-off is the relationship; the opportunity cost is the value of what you actually give up. If a council has one site, building a library there means no sports hall. The trade-off is library against sports hall. If the sports hall was the second choice, it is the opportunity cost.

Opportunity cost is not always money: a student revising on Saturday gives up the best alternative use of the time, such as paid work or rest.

Worked example: economic profit

A small bakery (illustrative) earns revenue of £9,000 a month and pays £5,200 in ingredients, wages and bills. The owner could rent the premises for £1,400 a month and could earn £2,600 a month working elsewhere.

Accounting profit = 9,000 - 5,200                    = £3,800
Opportunity costs = 1,400 (rent forgone) + 2,600     = £4,000
Economic profit   = 3,800 - 4,000                    = -£200

The bakery looks profitable on paper, but the owner is £200 a month worse off than in the next best use of the premises and time. Counting opportunity cost shows costs that no one pays out as cash.

2. The production possibility curve/frontier

A PPC/F is a curve or boundary showing the largest output pairings of two goods (or types of goods) that an economy can achieve in a given period when every resource is fully and efficiently employed and technology is fixed. Country A (illustrative) chooses between consumer goods and capital goods.

Point	Capital goods	Consumer goods	Consumer goods given up per extra 10 capital goods	Opportunity cost of 1 capital good
A	0	90
B	10	85	5	0.5
C	20	75	10	1.0
D	30	55	20	2.0
E	40	0	55	5.5

The frontier is drawn with capital goods on the horizontal axis and consumer goods on the vertical axis. It runs from 90 on the vertical axis to 40 on the horizontal axis and is bowed outward (concave to the origin). The bow shows increasing opportunity cost: 0.5 at the start rises to 5.5, because factors of production are not equally good at making both goods. The first resources moved suit capital goods best; later ones are better at making consumer goods.

If every resource were equally good at both uses, the PPC/F would be a straight line and opportunity cost would be constant.

What the PPC/F illustrates

• Scarcity. The frontier is a limit. A point beyond it, such as 30 capital goods with 70 consumer goods (point D allows only 55), is unattainable with current resources.
• Choice. Points A to E are all attainable. Selecting one means rejecting the others.
• Opportunity cost. Moving along the frontier from C to D gives 10 more capital goods and costs 20 consumer goods. The steepness of the curve at a point gives the opportunity cost of the horizontal-axis good there.
• Productive efficiency. Every point on the frontier is productively efficient: output of one good can rise only if output of the other falls. A point inside the frontier, such as 20 capital goods and 60 consumer goods, is productively inefficient. At 20 capital goods the economy could make 75 consumer goods, so 15 are lost to unemployed or poorly used resources.

A point on the frontier does not show whether the mix matches what people want. Productive efficiency is about using resources well; whether the mix is right is a separate question.

3. What shifts the PPC/F

A shift in the whole curve means the economy can produce more (outward) or less (inward) than before. A change in the amount of resources used does not shift it; it moves the economy along the curve or from inside the curve towards it.

Cause	Direction	Reason
Discovery of land, minerals or energy sources	Outward	More land or natural resources
Population growth, migration, a higher participation rate	Outward	More labour
Education and training	Outward	Better quality labour
Investment in capital	Outward	More and better capital
New technology	Outward	More output from the same inputs
War, flood, earthquake, resource depletion	Inward	Resources destroyed or used up

The shift can be parallel or one-sided. Suppose technology improves in consumer goods only, raising the consumer goods maximum by 20% (90 to 108) while the capital goods maximum stays at 40.

Point	Capital goods	Consumer goods (old)	Consumer goods (new)
A	0	90	108
B	10	85	102
C	20	75	90
D	30	55	66
E	40	0	0

The curve pivots outward on the vertical axis and meets the old curve at E. The opportunity cost of a capital good rises by 20% at each step (0.5 to 0.6, 1.0 to 1.2, 2.0 to 2.4, 5.5 to 6.6) because each unit of capital now gives up more consumer goods. Capital goods have become dearer in terms of consumer goods, though capacity to make them is unchanged.

4. Evaluating the usefulness of opportunity cost

For:

• It makes the cost of a choice complete, as the bakery shows, so decisions are judged against the best alternative rather than against nothing.
• It applies to every economic agent: a household choosing between work and leisure, a firm choosing between two investments, a government choosing between two budgets.
• It shows that “free” provision still has a cost: the use forgone.

Against:

• The next best alternative may be hard to identify, or its value hard to measure, especially when non-monetary, such as leisure, health or the environment.
• The alternatives forgone are often uncertain, as future values are unknown.
• It assumes agents know the alternatives and weigh them rationally; many choices are made from habit or with poor information.

Judgement. It is most useful when alternatives can be valued, as with a firm or a clear budget. It is less precise for social choices involving health or the environment, but even there it makes decision-makers name what they give up. It guides a decision; it does not make it.

5. Specialisation and the division of labour

Specialisation is concentrating on producing a narrow range of goods or services. It can apply to a worker, a firm, a region or a country. The division of labour is splitting production into separate tasks with each worker doing one, or a few, of them.

Worked example: a chair workshop

A workshop (illustrative) employs 6 workers, each paid £90 a day. When each builds whole chairs, each makes 2 a day, so output is 12. After the work is divided into cutting, assembly and finishing, with 2 workers on each task, output is 20 a day.

Output per worker: 12 / 6 = 2.0   ->   20 / 6 = 3.33
Rise in output: (20 - 12) / 12 x 100 = 66.7%
Labour cost per chair: 540 / 12 = £45   ->   540 / 20 = £27
Fall in cost per chair: (45 - 27) / 45 x 100 = 40%

Productivity rises because workers get faster with practice, less time is lost switching tools and tasks, and each task can be matched to the person best at it. Machines suit narrow tasks.

Its role in addressing scarcity

Scarcity is limited resources against unlimited wants. Specialisation raises output from the same labour, so more wants can be satisfied; the PPC/F effectively moves outward. Lower unit costs can mean lower prices.

There are limits:

• Repetitive work can lower motivation and quality, and raise absence.
• Workers may lose broader skills, so if their task disappears they find it harder to move to other work (occupational immobility).
• Specialising firms and regions are exposed if demand for their product falls.

Judgement. Specialisation addresses scarcity well where tasks are simple and markets are large enough to absorb the extra output. It works less well when it damages motivation or leaves workers or regions dependent on a single product. It eases scarcity but does not remove it.

6. How specialisation encourages trade and exchange

A specialist makes far more of one good than they need and none of the rest. To consume a range of goods, they must exchange. So specialisation and exchange come together: the more people specialise, the larger the market for trade.

Worked example: two producers

Asha and Imran (illustrative) each have 40 hours. Asha makes 1.5 kg of rice or 0.5 m of cloth an hour; Imran makes 0.5 kg of rice or 1.5 m of cloth an hour.

No specialisation (20 hours each good):
  Asha  30 kg rice, 10 m cloth      Imran 10 kg rice, 30 m cloth
  Total 40 kg rice, 40 m cloth
Specialisation (40 hours each):
  Asha  60 kg rice                  Imran 60 m cloth
Exchange 30 kg for 30 m:
  Asha  30 kg rice, 30 m cloth      Imran 30 kg rice, 30 m cloth

Total output rises from 40 kg and 40 m to 60 kg and 60 m. Each person ends with 20 more of the good they were weaker at making, and none less of the other. Exchange turns specialist output into a basket of goods. The example is deliberately symmetric; comparative advantage between countries belongs to the international trade topic.

7. Money and barter

Barter is the direct exchange of goods and services for other goods and services, with no money. Its problems:

• Double coincidence of wants. A baker who wants a bicycle repair must find a repairer who wants bread at that moment.
• No common measure of value. Pairing every good with every other gives n(n - 1)/2 rates for n goods: 28 for 8 goods and 190 for 20. With money, each good has one price, so 8 goods have 8 prices and 20 goods have 20.
• Indivisibility. A cow cannot be divided to pay for a loaf.
• Storing value. Perishable goods lose worth before they are spent.

Money solves these. It is a medium of exchange, so trade splits into selling for money, then buying with it; it is a unit of account, giving every good a single price; it is a store of value, letting you spend later; and a standard of deferred payment, letting debts be written in money.

Money cuts the time spent searching for trading partners, so people can specialise more and markets widen. Its value falls with inflation, and it needs trust in the issuer.

Common errors

• Naming every alternative as the cost when only the runner-up counts.
• Treating a point inside the PPC/F as impossible; it is attainable but inefficient.
• Shifting the PPC/F when employment rises, or drawing a movement along the curve for investment.
• Saying a straight-line PPC/F shows increasing opportunity cost.
• Evaluating the division of labour with only advantages, or listing disadvantages with no weighing.

Next, use the revision notes for a short version and the practice set for original questions with worked answers.

Official syllabus

OCR, A Level in Economics (H460) specification, Version 3.0 (June 2026), for first assessment in 2021, Component 1 content, areas of study Scarcity and choice (Opportunity cost; Specialisation and trade).