AQA GCSE Economics: Economic foundations: needs, wants, factors and opportunity cost (8136) – Revision Notes

These notes condense section 3.1.1, Economic foundations, of the AQA specification for GCSE Economics (8136), first taught from September 2017 (3.1.1.1 economic activity, 3.1.1.2 the factors of production, 3.1.1.3 making choices). For fuller explanations, read the study guide. When you are ready to test yourself, use the practice questions, the AQA GCSE Economics hub, the printable checklist, the wider How Markets Work guide and our free 10-minute diagnostics. The specification has no tiers. All figures here are invented.

Key definitions (3.1.1.1 to 3.1.1.3)

Term	Definition
Need	Something a person must have to stay alive and healthy (food, water, shelter, clothing)
Want	Something enjoyable that a person can manage without
Goods and services	Goods are physical items; services are activities done for others
Economic resource	An input to production that is limited in supply and can be used in more than one way
Factors of production	Land, labour, capital, enterprise
Scarcity	Not enough resources to meet everyone’s wants; this is the basic economic problem
Opportunity cost	The best option forgone because another was chosen
Consumers, producers, government	The three main economic groups

Needs and wants over time

• Needs are mostly stable; wants change with technology, income, place, age and fashion.
• Something can move from want to need once it becomes normal. A household may treat a broadband connection as a need because school work and job applications rely on it.
• Quality can blur the line. Food is a need, but expensive restaurant meals are a want.
• Central purpose of economic activity: to make goods and services that meet needs and wants.

The three key decisions

Decision	Ask	Typical contrast
What	Which outputs, and in what quantities?	Hospitals or roads
How	Which resources and methods?	Labour-intensive or capital-intensive
Who benefits	Who gets the output?	Those who can pay, or by need

Method for a “how to produce” cost comparison:

1. Work out total cost for each method (wages plus machine or other costs).
2. Divide by output to get cost per unit.
3. Compare, then add non-cost points such as jobs lost or the risk of relying on a machine.

The main groups and how they interact

• Consumers sell labour and receive wages, then spend on products.
• Producers hire resources, pay rewards, make products and receive revenue.
• Government collects taxes, provides public services, pays benefits, gives subsidies and sets rules.

Link them in a chain: a rise in a tax on firms lowers profit, which may lead to higher prices or fewer jobs, which changes what consumers can afford.

Factors of production and rewards

Factor	Examples	Reward	Quick test
Land	Fields, minerals, forests, fish, water	Rent	Is it a natural resource?
Labour	Drivers, teachers, engineers	Wages or salary	Is it human effort?
Capital	Machines, vans, tools, buildings	Interest	Was it made to help produce more output?
Enterprise	The business founder	Profit	Does the person coordinate production and bear the risk?

Must-know distinctions

• Capital versus money. In economics, capital is physical. Interest is paid to those who lend the money used to buy it.
• Profit versus the other rewards. The first three are normally fixed by agreement beforehand, whereas profit is the balance after they are paid, and it can be negative.
• Land versus raw materials. A natural resource in the ground is land; a processed ingredient bought in is a material.
• Resource versus product. A resource is an input; a product is an output.

Worked reminder: rewards. A firm in Town D (illustrative) has revenue £5,200. It pays wages £3,000, rent £500, interest £200 and other costs £700.

Profit = 5,200 - 3,000 - 500 - 200 - 700 = £800
Wages as % of revenue = 3,000 / 5,200 x 100 = 57.7%
Rent as % of revenue  =   500 / 5,200 x 100 =  9.6%

The owner (enterprise) receives the £800 and bears the risk that it might have been less.

Worked reminder: how to produce. A workshop in Town G (illustrative) makes 600 chairs a week. By hand: 12 workers at £350 = £4,200. With a machine: 4 workers at £350 plus £2,100 machine cost.

By hand:      12 x 350 = £4,200, so 4,200 / 600 = £7.00 a chair
With machine: (4 x 350) + 2,100 = £3,500, so 3,500 / 600 = about £5.83 a chair
Saving: 4,200 - 3,500 = £700 a week

Cost per chair favours the machine. The wider answer notes that eight jobs go and the workshop depends on orders staying high.

Scarcity and choice

• Resources are scarce; wants are unlimited. Therefore choices must be made, and every choice has a cost.
• Scarcity affects everyone: households (limited income and time), firms (limited budget), governments (limited tax revenue).
• Scarcity does not mean “poor”. It means resources cannot meet every want.

Costs, benefits and opportunity cost

Chains of reasoning that score well

• Scarcity leads to choice, choice means something is given up, and what is given up is the opportunity cost.
• A firm that switches to the more profitable crop gains profit but gives up the next best crop; the net gain is the difference.
• A government that funds one project has less to spend on others, so the opportunity cost is the best project it could not afford.

Method for any opportunity cost question:

1. List the options.
2. Identify the one chosen.
3. Find the best of the others, using the same units (output, money or time).
4. State the opportunity cost as that forgone option, with its amount.

Worked reminder: a farm. A farmer in Region E (illustrative) has 10 hectares. Profit per hectare: wheat £900, potatoes £1,150, sheep £700.

All potatoes: 10 x 1,150 = £11,500
All wheat:    10 x   900 = £9,000
All sheep:    10 x   700 = £7,000

Choosing potatoes, the next best alternative is wheat, so the opportunity cost is £9,000 of wheat profit. The extra gain is 11,500 - 9,000 = £2,500.

Switching only 4 hectares from wheat to potatoes: gain 4 × 1,150 = £4,600, lose 4 × 900 = £3,600, net +£1,000.

Worked reminder: an individual. Sam has a four-hour Saturday shift at £9 an hour: 4 × 9 = £36. If the next best use of those hours is a trip valued at £30, taking the shift gives a net advantage of £6. Sam must also weigh unmeasured costs such as tiredness.

Cost-benefit decision rule: compare net benefit (benefit minus cost) for each option, then question the data. Estimates can be wrong, some benefits cannot be priced, and different groups gain or lose.

Quick self-test

1. State one difference between a need and a want.
2. Give one reason a want can become regarded as a need.
3. Name the three key economic decisions.
4. A cafe in Town F (illustrative) pays three workers £1,100 each a month. Which factor of production is this and what is the total?
5. Name the reward to enterprise and say why it is uncertain.
6. A taxi driver can make 6 airport runs or 9 city runs in a day. What is the opportunity cost of one airport run?
7. A £5,000 loan used to buy a machine carries 4% annual interest. How much interest is paid in a year, and to which factor does it relate?
8. A council chooses a clinic with net benefit £48m over a bypass with net benefit £41m. State the opportunity cost.
9. Explain why scarcity is the basic economic problem.
10. Give one way government interacts with producers.

Answers

1. A need is essential for survival and health; a want is desirable but not essential.
2. Technology or social change can make a product normal, so doing without it causes real disadvantage.
3. What to produce, how to produce, and who is to benefit.
4. Labour; 3 × 1,100 = £3,300 in wages.
5. Profit; it is what remains after other rewards are paid, so it can be small or negative.
6. 9 / 6 = 1.5 city runs.
7. 5,000 × 0.04 = £200 a year; it is the reward to those who supply the money for capital.
8. The bypass, with a net benefit of £41m.
9. Resources are limited but wants are unlimited, so not everything can be produced and choices must be made.
10. Examples: taxing firms, subsidising them, or regulating safety or pollution.

Where marks are usually lost

• Treating opportunity cost as the money spent, rather than the best option given up.
• Giving several forgone options when the question asks for the opportunity cost.
• Writing “capital” and meaning cash.
• Matching rent to labour or interest to land; learn the pairs together.
• Giving an example without a definition when the question says “explain”.
• Stating a need or want as fixed, with no reference to time or circumstances.
• Calculating without units: write loaves, hectares, £ and so on.
• Describing a calculation result without applying it, for example saying the machine is cheaper but not weighing job losses.
• Confusing scarcity with a shortage of a single product.

Official syllabus

Source: the AQA GCSE Economics specification (8136), Version 1.0, published by AQA, for first teaching from September 2017. This page follows section 3.1.1, Economic foundations.