The economic problem
What you'll learn
- Why scarcity means every economy must make choices.
- The difference between economic goods and free goods.
- How to distinguish positive statements from normative statements.
- How households, firms and governments use factors of production and pursue different objectives.
The starting point: scarcity
Economics begins with a simple but powerful idea: resources are limited, but human wants are not. This creates the economic problem.
Scarcity, needs and wants
- Scarcity means there are not enough resources to satisfy everyone’s wants fully.
- Needs are goods or services considered essential, such as basic food, shelter, healthcare and education.
- Wants are desires for goods and services beyond basic survival, such as holidays, streaming subscriptions or upgraded phones.
Because of scarcity, societies must decide:
- What to produce.
- How to produce it.
- For whom it should be produced.
These choices happen at every level: a household choosing how to spend income, a firm choosing what to produce, and a government choosing between more spending on the NHS, defence, schools or debt interest.
Opportunity cost
Opportunity cost is the value of the next best alternative forgone when a choice is made.
If the government spends £5 billion on road building, the opportunity cost might be the extra hospital capacity, tax cuts or debt reduction that £5 billion could have funded instead.
Economic goods and free goods
A good is something that gives people satisfaction or usefulness. In economics, this includes physical products and services.
Economic goods and free goods
- An economic good is scarce, so it has an opportunity cost.
- A free good is not scarce in that situation, so using it has no opportunity cost.
Most goods are economic goods: housing, food, phones, train journeys, teachers’ time and hospital appointments. Even if something has a zero price to the user, it can still be an economic good because scarce resources are used to provide it.
Sunlight on a clear day may be a free good. But clean air in a polluted city is not really “free” in the economic sense, because protecting or improving it may require regulation, technology and reduced output from polluting activities.
Classifying a free treatment
A patient receives an NHS treatment and pays £0 at the point of use. Is it a free good?
- Identify whether scarce resources are used: doctors, nurses, medicine, equipment and hospital space are all limited.
- Consider the alternative uses of those resources: the same staff and equipment could have treated another patient or provided a different service.
- Conclude that the treatment is an economic good, even though the patient faces no direct price, because it has an opportunity cost.
Free price is not the same as a free good
Do not call something a free good just because consumers pay £0. A free good has no opportunity cost; an economic good can be free at the point of use but still scarce.
Showing scarcity with a PPC
A production possibility curve (PPC) shows the maximum combinations of two types of output an economy can produce using existing resources and technology efficiently.
It is useful because it shows scarcity, choice and opportunity cost in one diagram. Points on the curve are productively efficient, meaning the economy is producing the maximum possible output from its current resources. A point inside the curve shows unemployment or inefficient use of resources. A point outside the curve is currently unattainable.
When an economy moves along the PPC, producing more of one good means producing less of another. That lost output is the opportunity cost.
Calculating opportunity cost on a PPC
Suppose an economy moves from producing 100 consumer goods and 80 capital goods to producing 180 consumer goods and 50 capital goods.
- Calculate the gain in consumer goods: output rises from 100 to 180, so the gain is 80 consumer goods.
- Calculate the loss of capital goods: output falls from 80 to 50, so 30 capital goods are given up.
- Calculate the opportunity cost per extra consumer good:
So each extra consumer good costs 0.375 capital goods.
Evaluating scarcity and choice
Scarcity is central because it makes choices unavoidable. Households must prioritise spending, firms must decide which products are worth producing, and governments must allocate limited tax revenue. For example, during the UK cost-of-living squeeze, many households cut back on non-essential spending because food, energy and rent took up more of their income.
However, scarcity is not always fixed. Economies can reduce some forms of scarcity through investment, innovation, education, trade and better resource allocation. For example, renewable energy investment can reduce dependence on scarce fossil fuels over time.
Scarcity is permanent, but its severity can change
The economic problem does not disappear because wants keep developing, but economic growth, technology and better organisation can expand what is possible.
Positive and normative statements
Economists need to separate factual analysis from value judgements.
Positive and normative statements
A positive statement is testable using evidence. A normative statement is based on opinion or value judgement, often about what should happen.
Positive statements can be true or false, but the key point is that evidence could test them. Normative statements cannot be settled by data alone because they involve values such as fairness, desirability or morality.
Classifying statements
- “A rise in interest rates will reduce consumer borrowing.” This is positive because data on borrowing can test whether it happens.
- “The government should increase benefits for low-income households.” This is normative because it recommends what ought to happen.
- “Higher taxes would raise revenue but would be unfair.” This is mixed: “raise revenue” is positive, while “unfair” is normative.
Positive does not mean good
In economics, “positive” does not mean desirable. It means testable. A positive statement can describe something harmful, such as rising unemployment.
Economic agents: who makes the choices?
Economic agents are the decision-makers in an economy.
| Economic agent | Main role | Common objectives |
|---|---|---|
| Households | Supply labour and buy goods and services | Utility, income, security, quality of life |
| Firms | Produce goods and services using resources | Profit, growth, market share, survival |
| Government | Tax, spend, regulate and provide services | Welfare, growth, low inflation, low unemployment, fairness, environmental goals |
Households, firms and governments interact constantly. For example, households supply labour to firms and receive wages. Firms sell goods and services to households. Governments tax incomes and profits, then use revenue to fund services such as education, healthcare and infrastructure.
Factors of production and their rewards
The factors of production are the resources used to produce goods and services.
| Factor of production | Meaning | Reward |
|---|---|---|
| Land | Natural resources, such as oil, farmland, water, minerals and wind | Rent |
| Labour | Human physical and mental effort | Wages or salaries |
| Capital | Human-made resources used to produce output, such as machinery, factories, software and roads | Interest |
| Enterprise | Organising production, taking risks and innovating | Profit |
Capital in economics usually means physical capital, not simply money. Money can help buy capital, but a £10 note does not itself produce output.
Capital does not just mean cash
If an exam asks for a factor of production, “capital” usually means man-made productive resources, such as machinery or buildings, not financial savings.
Rationality: a model of behaviour
Economists often assume agents are rational.
Rationality
Rationality is the assumption that economic agents use available information to choose the option that best achieves their objectives, given constraints such as income, time and the law.
This does not always mean selfishness. If a household values the environment, buying a more expensive low-carbon product can still be rational for that household.
A useful idea is marginal thinking. “Marginal” means extra or additional. A rational agent compares marginal benefit, the extra benefit from an action, with marginal cost, the extra cost.
Applying marginal reasoning
A household is considering reducing heating use during winter. This would save £12 per week, but the lost comfort is valued at £8 per week.
- Identify the marginal benefit: the household saves £12 per week.
- Identify the marginal cost: the household gives up comfort valued at £8 per week.
- Compare the two: because MB>MCMB > MCMB>MC, the choice appears rational, with a net benefit of £4 per week, assuming there are no health risks.
Evaluating rationality and objectives
Rationality is useful because it helps economists build models and predict responses to incentives. If train fares rise, some passengers may switch to buses or work from home. If wages rise in a sector, more workers may apply for those jobs.
But rationality is only a simplification. In reality, agents may have limited information, habits, emotions, social pressures and behavioural biases. Bounded rationality means people try to make sensible decisions, but their choices are limited by imperfect information and limited time.
Different agents also have different objectives. Firms may not always maximise profit; some may prioritise growth, ethical branding, executive bonuses or survival. Governments may aim to improve welfare, but they may also respond to elections, pressure groups and short-term media attention. Households may balance income, leisure, family responsibilities and values.
A strong evaluation point is that behaviour depends on context. A supermarket in a competitive market may focus heavily on price and profit margins. A social enterprise may accept lower profit to meet environmental goals. A government during a recession may prioritise jobs and demand, while during high inflation it may prioritise price stability.
Rationality is a benchmark
Use rationality as a starting assumption, then evaluate it by considering information problems, behavioural biases and the agent’s actual objective.
In the exam
- Define key terms precisely: scarcity, opportunity cost, economic good, free good, positive statement and normative statement.
- When using a PPC, explain what each point shows: efficient production, unemployment, unattainable output and opportunity cost.
- For evaluation, compare short-run and long-run effects, and always ask whose objective is being prioritised: households’, firms’ or the government’s.
Check yourself
- Why is NHS treatment an economic good even when patients pay £0 at the point of use?
- How does a PPC show scarcity, choice and opportunity cost?
- Give one reason why rationality is useful and one reason why it may be unrealistic.
