1.1 - The economic problem
Economics explains how people use limited resources when they cannot satisfy every want. Learn how scarcity creates choices, how households, firms and governments make those choices, and how economists distinguish evidence from judgements about what should happen.
Scarcity and choice
Scarcity means that available resources are insufficient to satisfy all the uses people want to make of them.
Needs are things regarded as essential for living, such as adequate food and shelter; wants are other desired goods and services. What people regard as essential can vary with circumstances. Wants can expand as incomes, technology and expectations change, while resources, including time, remain limited. The economic problem is therefore how to allocate scarce resources among competing uses.
Scarcity is not the same as poverty or a temporary shortage. A wealthy household still cannot spend the same evening both at home and at a concert. A hospital with a large budget must still decide how many staff to allocate to different treatments. Greater resources relax particular constraints but do not remove every choice.
An economic good uses scarce resources and has an opportunity cost: producing or consuming it sacrifices another possible use. A free good is available in sufficient abundance to meet demand in the relevant circumstances, with no opportunity cost of consuming an extra unit. Unpolluted air may be a free good in one location, while clean air supplied in a sealed facility uses scarce filters and energy. A zero selling price does not make a good free in the economic sense: a publicly funded vaccination still uses nurses, equipment and time.
Consider an illustrative council with £12 million available for two projects costing £8 million each. It cannot fund both in full. It can choose one, alter their scale or seek extra revenue, but extra taxes also use households' resources. A sound judgement identifies the benefit sacrificed, the people affected and whether a different arrangement could use the resources better. It does not assume that every choice is equally desirable merely because scarcity exists.
Agents and their objectives
Economic agents make decisions that influence production, consumption and the allocation of resources.
Households supply factors of production, receive income, consume goods and services, save and sometimes borrow. They often seek utility, meaning satisfaction from consumption and other activities. Utility need not mean buying as much as possible: leisure, helping others and future security can provide satisfaction too.
Firms organise production by combining resources and selling output. Profit is revenue minus costs, but firms may also pursue growth, sales, survival, customer service or social purposes. A new business may accept low current profit to build a customer base. A charity still faces costs and scarcity even though distributing profit is not its objective.
Government raises revenue, purchases and provides services, sets rules and can redistribute income. It may pursue efficiency, fairness, economic stability and environmental protection. These objectives can conflict: a low fare may improve access to transport but leave less public money for another service. Governments also contain elected decision-makers, officials and different departments whose priorities need not coincide.
Agents interact rather than operating in isolation. Households buy a firm's output and supply its labour; the firm pays wages and taxes; government buys services and makes transfers to households. An illustrative employer offering overtime may seek more output, a worker may value either the extra income or time with family, and government may consider both tax revenue and working conditions.
To evaluate an objective, ask whose interests it serves, the relevant timescale and what it sacrifices. Profit can encourage a firm to use resources carefully, but private profit alone need not include harm to neighbours. A household's current consumption may conflict with future security. A government's intended social benefit can be limited by poor information or implementation. The existence of an objective does not establish that it is achieved.
Factors and their rewards
Factors of production are the resources used to produce goods and services.
| Factor | Meaning | Conventional reward | Example in a bakery |
|---|---|---|---|
| Land | Natural resources, including sites, water and minerals | Rent | The site and water |
| Labour | Human effort and skills used in production | Wages | Bakers' time and skill |
| Capital | Produced resources used to make other goods and services | Interest | Ovens and mixing machinery |
| Enterprise | Organising the other factors, innovating and bearing business risk | Profit | Establishing and running the bakery |
Capital here means productive equipment, not simply a pile of money. Money can finance an oven, but the oven contributes directly to production. A consumer's cake is not capital; equipment used to produce cakes is. Human skills are supplied through labour, even though economists may also describe education and training as investment in human capital.
The rewards are conventional categories, not a rule that every payment has only one role. The owner who works in the bakery may receive wages for labour as well as profit for enterprise. Interest is the conventional return associated with financing capital; an oven does not itself hand its owner an interest payment. Profit is uncertain and can be negative, reflecting the risk borne by enterprise.
In an illustrative production budget, 30 of 50 worker-hours are used to make bread. The fraction is , and the ratio of bread-hours to other hours is . Bread uses of worker-hours. If this rises to 35 hours out of the same 50, its share becomes 70%: an increase of 10 percentage points. Bread-hours themselves rise by . The denominator tells you what the statistic measures.
Evidence and value judgements
Positive statements concern what is, while normative statements include a judgement about what ought to be.
A positive statement can in principle be tested against evidence. “A higher admission price will reduce weekly museum visits, other things equal” is positive because observation could support or reject the prediction. Positive does not mean true: a mistaken factual claim is still positive. Predictions are not automatically normative just because their outcomes are uncertain.
A normative statement depends on values, such as “Museums should admit every child free.” Evidence about attendance, costs and educational benefits can inform this judgement, but evidence alone cannot decide the weight society should put on equal access rather than another use of funds. Words such as fair, excessive and desirable often signal a judgement, although classification depends on the meaning of the whole statement.
Separate mixed claims. “A free-entry policy increased attendance by 20%, so the council should retain it” contains a testable attendance claim and a policy judgement. To investigate the positive part, check the period, measurement and alternative explanations, such as a new exhibition. To discuss the normative part, make the relevant objective explicit and compare costs and benefits.
An illustrative study finding that attendance rose after a fee was removed does not by itself prove that the fee caused the whole rise. Other conditions may have changed. Economic reasoning combines evidence with stated assumptions, while keeping the recommendation's underlying values visible.
Rationality and its limits
Rationality models agents as choosing the option that best serves their objectives given the information and constraints they face.
A rational household compares the expected benefits and costs of feasible options; a rational firm compares choices against its objective, often profit. Rational does not mean selfish or perfectly informed. Donating money can be rational if helping others is part of a person's objective. Choosing a cheaper meal can be rational for a tight budget even if a more expensive meal would bring greater satisfaction in isolation.
The model is useful because it predicts responses. If two otherwise identical products offer the same benefit, a price reduction makes one more attractive. An employer can predict that higher pay may help attract workers because it raises the reward from working. Explicit assumptions also make a prediction testable rather than explaining every result after the event.
However, collecting information takes time and effort. Bounded rationality describes decisions made with limited information and limited ability to process it. A consumer may choose a satisfactory energy contract rather than calculate the best possible contract across hundreds of offers. Habits, framing, emotions and attention can influence choices: a person may keep an expensive subscription because cancelling is inconvenient or rarely considered.
An apparent departure from a simple model is not automatically irrational. The consumer may value a trusted supplier, face a cancellation cost or expect a service difference the observer has missed. Evaluate rationality by asking whether the objective and constraints are plausible, whether the model predicts the behaviour usefully, and what additional explanation the evidence supports.
For an illustrative recycling reward, rational comparison suggests that a higher payment can encourage more sorting. Yet households lacking storage space may respond little, and complicated rules may obscure the reward. The model explains the incentive's direction while practical constraints explain why its size varies. Greater wealth or a reward can reduce one constraint without abolishing scarcity.
Quick recap
Scarcity creates choices even when goods have no selling price. Identify the agents, resources, rewards and objectives involved; separate testable claims from value judgements. Rationality provides a useful model of choice when its objectives, information and constraints are stated honestly.