Cambridge O Level Economics: International specialisation (2281) – Revision Notes

These notes condense section 6.1 (6.1.1 and 6.1.2, international specialisation) of the Cambridge O Level Economics (2281) syllabus for examination in 2026, version 2. There are no tiers. For full explanations use the study guide, then try the practice questions. Also useful: the Cambridge O Level Economics hub, the printable checklist and the free diagnostics. All figures below are invented and illustrative.

6.1.1 Specialisation at a national level

Definition: a country puts most of its productive capacity into a limited range of products and swaps part of that output with other countries for the products it does not make.

Basis	Meaning	Example reasoning
Superior resource allocation	Resources are used where they are most productive	A country rich in fertile land puts land into farming and gets more output
Cheaper production methods	Lower cost per unit	Better technology or skills mean more output per worker, so unit cost falls

Either basis can apply on its own, or both together.

Method: showing which country should make which good

1. Write each country’s maximum output of each good.
2. Opportunity cost of good A = maximum of B / maximum of A.
3. Whichever country gives up less to make a good has the stronger case for making it.
4. Compare world output before and after.

Worked reminder. Country J can make 60 tonnes of rice or 20 phones. Country K can make 40 tonnes of rice or 40 phones.

• J: 1 phone costs 60 / 20 = 3 tonnes of rice.
• K: 1 phone costs 40 / 40 = 1 tonne of rice.
• K gives up less to make phones, so K should make phones and J rice.

Worked reminder: gains from specialising and trading

Country H can make 48 tonnes of fish or 24 tools. Country I can make 30 tonnes of fish or 45 tools.

	Fish	Tools
H before (half its resources on each)	24	12
I before (one third on fish, two thirds on tools)	10	30
World total before	34	42
H after (all fish) and I after (all tools)	48	45
Gain in world output	14	3

• Opportunity cost of a tool: H gives up 48 / 24 = 2 tonnes of fish, I gives up 30 / 45 = 0.67 tonnes. I should make tools and H fish.
• Trade at 1 tool for 1 tonne of fish. This rate lies between 0.67 and 2, so both can gain. H buys 14 tools and pays 14 tonnes.
• H ends with 48 - 14 = 34 tonnes and 14 tools, against 24 and 12. I ends with 45 - 14 = 31 tools and 14 tonnes, against 30 and 10. Both countries are better off.

Formulas

Item	Rule
Opportunity cost of good A	Quantity of B given up / quantity of A gained
Unit labour cost	Wage per day / output per worker per day
Average cost	(Fixed cost + variable cost x output) / output
Percentage change	(new - original) / original x 100
Export share	Value of exports of one good / total export earnings x 100

Worked reminder (unit cost). Fixed costs 240,000, variable cost 5 per unit.

• 20,000 units: (240,000 + 100,000) / 20,000 = 17.
• 80,000 units: (240,000 + 400,000) / 80,000 = 8.
• Fall = (17 - 8) / 17 x 100 = 52.9%.

Worked reminder (labour cost). Wage 18 per day and 6 units made: 18 / 6 = 3. Wage 20 per day and 10 units made: 20 / 10 = 2. The higher-wage country has the lower unit cost.

6.1.2 Advantages and disadvantages

Group	Advantages	Disadvantages
Consumers	Lower prices, wider choice, better quality	Fewer home-made goods, import prices may rise, supply may be disrupted
Firms	Larger markets, economies of scale, expertise	Cheaper imports for non-specialised firms, dependence on a few buyers, exposed to price falls
The economy	More output and income, export earnings, jobs, efficient resource use	Over-dependence, structural unemployment, resource depletion, exposed to events abroad

Chains of reasoning to learn

• Lower costs: specialise → higher output → fixed costs spread over more units → lower average cost → lower price or higher profit.
• Over-dependence: one main export → world price falls → export earnings fall → incomes, jobs and tax revenue fall → less money for imports.
• Structural unemployment: industries not specialised in decline → workers lose jobs → skills do not match new jobs → unemployment lasts.

Worked reminder (dependence). A crop earns 25 million. The world price falls 20% and the volume sold stays the same: 25 x 0.80 = 20, so the loss is 5 million, or 20% of the crop’s earnings. In a different country the crop earns 18 million, which is 75% of total export earnings of 24 million. The same 20% fall costs 18 x 0.20 = 3.6 million, so total earnings fall by 3.6 / 24 = 15%, as 0.75 x 20 = 15.

Evaluation checklist

• Say how far the gains outweigh the costs, and name what it depends on.
• Useful depends-on points: how diversified exports are, how stable the price of the main export is, how easily workers retrain, how big the home market is, and how long the time period considered is.
• Separate short run (job losses, adjustment) from long run (lower costs, higher income).
• Give a clear judgement at the end.

Writing a developed answer

For a question that asks you to explain an advantage or disadvantage, use a short chain of three links:

1. Point: name the group and the effect, for example “consumers pay lower prices”.
2. Reason: say why it happens, for example “firms in the specialised industry produce at lower unit cost and compete for sales”.
3. Result: say what follows, for example “households can buy more with the same income”.

For a question that asks you to discuss or evaluate, add a second side and a judgement. A balanced answer on a country that relies on one export would give the gain (high export earnings while the world price is strong), the cost (earnings, jobs and tax revenue fall together when it drops), and a decision that names what it depends on, such as diversification or retraining.

Must-know distinctions

Idea A	Idea B
Superior resource allocation (resources used where they are most productive)	Cheaper production methods (lower cost per unit)
Benefit for consumers (price, choice, quality)	Benefit for firms (market size, scale, profit)
Cyclical drop in demand (temporary)	Structural unemployment (skills do not match jobs)
Specialisation	Diversification (spreading output across many products)

Quick self-test

1. Define specialisation at a national level.
2. Name the two bases of national specialisation given in the syllabus.
3. Country A can make 80 tonnes of wheat or 20 vehicles. Calculate the opportunity cost of one vehicle.
4. Country B can make 30 tonnes of wheat or 30 vehicles. Which country should make vehicles, A or B?
5. A firm’s fixed costs are 120,000 and it pays 4 for each unit made. Calculate its average cost when it makes 10,000 units.
6. Calculate average cost at 40,000 units and the percentage fall.
7. Give two advantages of national specialisation for consumers.
8. Give one advantage of specialisation for firms.
9. Give two disadvantages of specialisation for the economy.
10. A good is sold for 50 and its price falls to 42. Calculate the percentage change.
11. State one reason why a country might have a lower unit labour cost despite higher wages.
12. Explain why a country with one main export is at risk.

Answers

1. A country puts most of its productive capacity into a limited range of products and trades for the rest.
2. Superior resource allocation and cheaper production methods.
3. 80 / 20 = 4 tonnes of wheat.
4. B: opportunity cost of a vehicle is 30 / 30 = 1 tonne, below A’s 4. Country B.
5. (120,000 + 40,000) / 10,000 = 16.
6. (120,000 + 160,000) / 40,000 = 7. Fall = (16 - 7) / 16 x 100 = 56.25%.
7. Lower prices and wider choice (also better quality).
8. A larger market, so economies of scale (or expertise, or higher profit).
9. Over-dependence on a few exports, structural unemployment (also resource depletion, exposure to events abroad).
10. (42 - 50) / 50 x 100 = -16%.
11. Higher output per worker, from better technology or skills.
12. If the price or demand for that export falls, export earnings, jobs, incomes and tax revenue all fall together, and the country has little else to sell.

Where marks are usually lost

• Defining specialisation as “a country being good at everything”.
• Giving a general benefit with no group named (consumers, firms or the economy).
• Stating “lower prices” for firms, when it is a consumer benefit.
• Saying cheap labour always means cheap production.
• Quoting an opportunity cost the wrong way up.
• Using the new cost as the base for a percentage fall.
• Giving disadvantages with no explanation of what happens to jobs, income or prices.
• Writing an evaluation with no judgement or no “depends on” point.
• Confusing structural unemployment with a temporary fall in demand.

Official syllabus

Cambridge O Level Economics (2281) syllabus for examination in 2026, version 2, published by Cambridge University Press & Assessment: section 6.1 International specialisation.