IGCSE Economics: The Basic Economic Problem (Cambridge 0455)

This guide covers Topic 1 The basic economic problem, for Cambridge IGCSE Economics 0455, 2026 series (Version 2 — no significant changes affecting teaching from the prior version). Economics at 0455 is not tiered: all candidates study the same content.

Where this fits in 0455

The basic economic problem is the first of eleven topics in 0455, and it supplies the vocabulary every later topic depends on — scarcity, opportunity cost, and the factors of production reappear whenever the syllabus later asks candidates to analyse a market, a firm’s decisions, or government policy. The production possibility curve introduced here is also the diagram examiners return to most often when testing whether a candidate genuinely understands trade-offs, rather than just being able to recite the term “opportunity cost.”

Syllabus coverage

CAMBRIDGE IGCSE ECONOMICS 0455 — TOPIC 1 THE BASIC ECONOMIC PROBLEM

• 1.1 The nature of the economic problem — 1.1.1 finite resources and unlimited wants: defining and exemplifying the economic problem for consumers, workers, producers and governments; 1.1.2 economic and free goods: the difference between goods that require resources to produce and those that do not
• 1.2 The factors of production — 1.2.1 definitions and examples of land, labour, capital and enterprise, and the reward each earns; 1.2.2 the influences on the mobility of the various factors; 1.2.3 the causes of changes in the quantity and quality of the factors of production
• 1.3 Opportunity cost — 1.3.1 defining and exemplifying opportunity cost in different contexts; 1.3.2 how opportunity cost influences the decisions of consumers, workers, producers and governments when allocating resources
• 1.4 Production possibility curve (PPC) diagrams — 1.4.1 defining, drawing and interpreting a PPC; 1.4.2 the significance of points under, on and beyond a PPC; 1.4.3 movements along a PPC and their link to opportunity cost; 1.4.4 the causes and consequences of shifts in a PPC in terms of an economy’s growth

Worked examples

Free good vs economic good. Air is a free good — unlimited in supply, with no opportunity cost and no price. Oil is an economic good — scarce relative to demand, so obtaining it has an opportunity cost and it commands a price. The test is never “does it cost money at the till” but whether resources had to be sacrificed to produce or extract it.

Opportunity cost. A government deciding whether to spend on defence or on healthcare cannot do both with the same budget. If it builds a new fleet, the opportunity cost is the hospitals, staff and treatments that could have been provided instead — the next best alternative forgone, not simply “the money spent.” Because government budgets are finite, this kind of trade-off is why spending decisions are politically contested rather than purely technical.

Economic growth vs an increase in productive capacity, on a PPC. An increase in productive capacity is shown by an outward shift of the whole PPC, caused by more or better resources or improved technology. Economic growth can also occur in the short run simply by moving from a point inside the curve towards it — using existing idle resources more fully, with no change in what the economy is capable of producing at maximum. Only the outward shift represents a permanent increase in capacity; a movement towards the curve is temporary and reversible if resources fall idle again.

How to approach it

This topic is conceptual and diagram-based rather than numerical, so the strongest exam preparation is being able to draw a PPC from a blank page, correctly, under time pressure — labelling axes, showing a point inside the curve as productively inefficient, a point beyond it as currently unattainable, and a shift of the whole curve as a change in an economy’s productive capacity rather than a movement along it. Candidates frequently blur “movement along” with “shift of” a PPC; keeping the distinction sharp (a movement reallocates existing resources between two goods, a shift changes what the economy is capable of producing at all) is worth deliberate practice. For the factors of production, work through examples of each factor drawn from a real, unfamiliar context in the exam question, rather than reciting land/labour/capital/enterprise definitions in the abstract — that is consistently where marks are lost.

Self-test

1. Why is air a free good but oil an economic good?
2. A government chooses to spend on a new airport rather than new schools. What is the opportunity cost of that decision?
3. An economy is currently producing at a point inside its PPC. Explain one way it could achieve economic growth without any new resources or technology.
4. Distinguish between a movement towards a PPC and an outward shift of a PPC, and state which one represents a permanent change in what an economy can produce.

Answers: 1. Air is unlimited in supply with no opportunity cost and no price, while oil is scarce relative to demand, so obtaining it requires sacrificing other resources and it commands a price. 2. The schools, teachers and equipment that could have been provided instead — the next best alternative forgone, not the money itself. 3. It could make fuller use of its existing idle resources, moving from a point inside the curve towards it, without any change in maximum capacity. 4. A movement towards the curve reflects better use of existing resources and is reversible; a shift of the whole curve reflects more or better resources or improved technology, and only the shift is a permanent increase in productive capacity.

For exam-style questions with full mark schemes on this topic, see the Basic Economic Problem practice questions.

Official syllabus

Cambridge IGCSE Economics 0455 syllabus for 2026 (Version 2, December 2025) — cambridgeinternational.org.