OCR A Level Economics: Scarcity, choice, the margin and the market economy (H460)

This guide follows the OCR A Level Economics (H460) specification, Version 3.0 (June 2026), for first assessment in 2021. It covers the area of study Scarcity and choice in Component 1, Microeconomics: the basic economic problem, the market economy and the concept of the margin. The whole specification is A Level and the text labels no content as AS or Extension. All figures in worked examples are invented and illustrative.

Opportunity cost, the production possibility frontier, specialisation, resource allocation, economic systems and objectives have their own pages. This page stays with the topics below. Start from the Microeconomics overview, the OCR Economics hub and the printable checklist. Check where you stand first with the free diagnostics.

What this unit covers

Topic	You must be able to
The basic economic problem	Explain and distinguish economic and free goods, needs and wants, positive and normative statements. Explain scarcity and the economic problem, and evaluate their implications. Explain the impact of sustainability. Explain the roles of government, firms and households. Explain the factors of production and their rewards
The market economy	Evaluate its strengths and weaknesses, and the role of government within it
The concept of the margin	Explain the margin, calculate marginal values from data, evaluate how useful the marginal concept is for decision making, and evaluate rationality

1. Goods, scarcity and the economic problem

Economic goods are goods and services that use up scarce resources to produce, so someone has to give something up to supply them. Free goods need no resources to supply and have no price because nobody has to give anything up for more of them. Sunlight reaching a field is a standard example. Be careful with “free” in everyday speech: a state-funded school place costs the user nothing at the point of use, but it is an economic good because teachers, buildings and materials are used. Whether a good is free can change: clean air in a remote valley may be free, while clean air in a smoggy city needs resources to protect.

Needs are what a person must have to survive or avoid serious harm, such as food, water and shelter. Wants are things people desire beyond that. The line moves with time and place: reliable internet access is a want in one society and close to a need for working life in another. Economics rests less on the distinction than on the fact that wants have no fixed limit.

Scarcity is the gap between unlimited wants and the limited resources that can satisfy them. It is not rarity: tap water may be plentiful, yet it is scarce in the economic sense because supplying it uses resources. Scarcity forces choice, which gives the basic economic problem: every society must decide what to produce, how to make it and who gets it.

Evaluating the implications. A chain for a strong answer:

• Resources are limited, so using them for one purpose means not using them for another. Every decision by a household, firm or government involves giving something up.
• Because choices must be made, some mechanism is needed to make them. Prices, government decisions or a mixture can do it, and each has costs.
• The problem never disappears. Growth raises output, but wants tend to rise with it. Richer countries still face hard choices, for example between spending on health, defence or tax cuts.
• Judgement: the problem is permanent, but its severity depends on resources, technology and how well choices are made. Poor choices (wasted resources) make scarcity worse than it needs to be.

2. Positive and normative statements

A positive statement describes or predicts, and evidence can check it, so it is either true or false. A normative statement expresses an opinion on what ought to happen, so evidence alone cannot settle it. Words such as “should”, “fair” and “better” are warning signs, but test the whole statement.

Statement (Country A, illustrative)	Type	Reason
Unemployment rose from 5% to 7% last year	Positive	Checkable against data
Unemployment is too high	Normative	“Too high” is a judgement
A rise in the minimum wage will reduce employment	Positive	A prediction, which may be wrong but is testable
The government should raise the minimum wage	Normative	Depends on values

A positive statement that proves wrong is still positive. Policy debate mixes both: positive analysis finds consequences, normative judgement chooses between them.

3. Sustainability, scarcity and choice

Sustainability means using resources to satisfy today’s needs in a way that leaves future generations able to satisfy their own. Using a resource faster than it renews makes it scarcer in future, which forces harder choices later.

Worked example (invented). A managed woodland holds 12,500 cubic metres of timber, which grows by 6% of the stock each year. Loggers fell 1,000 cubic metres a year.

• Year 1 growth: 12,500 × 0.06 = 750. Stock at year end: 12,500 + 750 − 1,000 = 12,250.
• Year 2 growth: 12,250 × 0.06 = 735. Stock: 12,250 + 735 − 1,000 = 11,985.
• Year 3 growth: 11,985 × 0.06 = 719.1. Stock: 11,985 + 719.1 − 1,000 = 11,704.1.

The stock shrinks every year, and the growth shrinks with it, so felling 1,000 is not sustainable. Felling 750 would hold the stock at 12,500. The choice today is between more timber now and a larger stock for the future.

Impact on scarcity and choice: depletion makes the resource scarcer, raises the price of timber and pushes firms toward substitutes. Governments may set quotas, limiting current consumption. Sustainable practice (renewable energy, recycling, replanting) can ease long-run scarcity but often costs more now. Evaluate by asking who bears the cost today and who gains later.

4. Economic agents, factors of production and their rewards

Households supply factors of production (mainly labour) and spend income on goods and services. Firms combine factors to produce goods and services, employ labour and pay for resources. Government provides goods and services, taxes, regulates, redistributes income and also acts as an employer and a buyer.

Factor	Nature	Reward
Land	Natural resources: soil, minerals, water, forests	Rent
Labour	Human effort and skill	Wages and salaries
Capital	Man-made goods used to produce other goods, such as machines	Interest
Enterprise	Organising the factors and bearing risk	Profit

Capital here means physical capital, not money.

Worked example (invented). A tile-making firm has revenue of £640,000 and buys £140,000 of materials. It pays £275,000 in wages, £45,000 in rent and £35,000 in interest.

• Value added = 640,000 − 140,000 = £500,000, which is shared among the factors.
• Profit (the reward to enterprise) = 500,000 − 275,000 − 45,000 − 35,000 = £145,000.
• Shares: wages 55%, rent 9%, interest 7%, profit 29%, which total 100%.

Materials are not a factor reward: they are the payment to other firms for their output.

5. The market economy

In a market economy, private owners and consumers make most decisions, and prices coordinate them.

Strengths (each with a chain):

• Price signals: if demand for a good rises, its price rises, firms earn more by supplying it, and resources move to it without anyone planning the move.
• Consumer choice: firms that supply what people want survive, so consumer wants steer production.
• Incentives and efficiency: the profit motive pushes firms to cut costs and innovate; workers are paid for effort and skill.
• Decentralised decisions use information that no single planner could gather.

Weaknesses:

• Market failure: where costs or benefits fall on third parties, or where goods cannot be priced, the market may over- or under-provide.
• Inequality: reward follows ownership and skill, so those with few resources get little.
• Market power: a dominant firm can restrict output and raise prices.
• Instability and short-term focus: booms, slumps and neglect of long-run concerns such as sustainability.

Role of government within the market economy. Typical roles are to provide a legal framework and property rights, supply goods the market under-provides, correct externalities with taxes, subsidies or regulation, promote competition, redistribute income and stabilise the economy.

Evaluation. Intervention can improve outcomes, but governments have limited information, face political pressure, and policies can have unintended consequences or high costs (government failure). The judgement depends on the size of the failure, the quality of the policy, the time available and the value judgements about fairness. A strong answer weighs a named market failure against a named risk and reaches a supported conclusion.

6. The concept of the margin

The margin is the point at which a decision is made about one more or one less unit. Economic agents compare marginal benefit with marginal cost: do one more if the extra benefit is at least the extra cost.

Calculating marginal values. Marginal value = change in total ÷ change in quantity. With one-unit steps, subtract consecutive totals.

Worked example 1 (invented): a small candle maker. It sells batches of candles at £21 a batch. Total cost (TC) includes £24 fixed cost.

Batches	0	1	2	3	4	5	6
TC (£)	24	38	50	60	73	90	112
Marginal cost (£)		14	12	10	13	17	22
Revenue (£)	0	21	42	63	84	105	126
Profit (£)	−24	−17	−8	3	11	15	14

Marginal revenue is £21 for every batch. Marginal cost is below £21 up to batch 5 (£17) and above it at batch 6 (£22). A sixth batch adds £22 of cost for £21 of revenue, so profit falls from £15 to £14. The candle maker chooses 5 batches. The fixed cost does not appear in marginal cost.

Worked example 2 (invented): a consumer. Marginal utility (MU) is the extra satisfaction from one more unit. Suppose total utility from cups of coffee is 30, 52, 68, 78, 84, 84 and 80 for 1 to 7 cups.

• MU: 30, 22, 16, 10, 6, 0, −4.
• MU falls as consumption rises, which is diminishing marginal utility.
• If one unit of utility is valued at £0.10, marginal benefit is £3.00, £2.20, £1.60, £1.00, £0.60 and so on. This conversion is an assumption made for illustration.
• At a price of £1.20 the consumer buys 3 cups: the third has a marginal benefit of £1.60, above the price, while the fourth (£1.00) is below it.

How useful is the margin? For: it explains why decisions are small adjustments (one more hour, one more worker), why fixed or “sunk” costs should not affect the next choice, and it underpins supply and demand analysis. Against: agents often lack the data to know their marginal values; some decisions are all-or-nothing; satisfaction and environmental damage are hard to measure; and firms may use rules of thumb. Judgement: it is a powerful guide to what should be done in decisions that can be varied by small amounts, and weaker as a description of real behaviour.

Rationality. In basic models, a rational agent has consistent preferences and aims to maximise utility (households), profit (firms) or welfare (government), using the available information. Evaluation: the assumption keeps models simple and predicts well in many markets, such as how firms respond to a tax. But people have limited information and time, follow habits, copy others, care about fairness, and can make decisions that serve them poorly. Rationality is a useful starting point, and more reliable for firms with clear goals than for households making one-off decisions.

Common errors

• Defining scarcity as “not enough” or as rarity. Link it to unlimited wants and limited resources.
• Calling a statement normative just because it is wrong, or positive just because it contains a number.
• Treating capital as money, or counting materials as a factor reward.
• Putting fixed cost into marginal cost, or dividing by the wrong quantity step.
• Listing strengths and weaknesses with no judgement on which weighs more.

See the revision notes for a compact 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, area of study Scarcity and choice.