Cambridge IGCSE Economics (code 0455) teaches you to explain how people, firms and governments make choices when resources are limited. It is assessed through understanding, application, data handling and written reasoning, not only recall. This guide maps the subject, suggests a study order and points out where students usually get stuck.
Which code is this subject?
The Cambridge IGCSE Economics code is 0455. Paper structure, timings, weightings and assessed content can change between exam years. We do not list them here, because a guess could send you to the wrong plan.
Read the current Cambridge subject page for your exam year, and confirm your entry with your school or exam centre. The 0455 code guide and the assessment guide explain what to check, and the syllabus and exam-year navigator returns a checking list when a combination is unknown. Entries and results are handled by your exam centre and Cambridge, not by us.
How is the subject built?
Think of five skills that feed each other:
- Knowing terms: scarcity, opportunity cost, demand, supply, elasticity, inflation and the rest.
- Using models: drawing and reading diagrams, and saying what each curve means.
- Handling data: percentages, index numbers, per-person measures and ratios.
- Reasoning: building a chain from cause to effect, and stating the assumption behind each link.
- Judging: weighing evidence and writing a conclusion no stronger than the evidence.
Topics change, but these skills do not. A student who can name which curve moved, calculate from the right base and qualify a conclusion can handle most unfamiliar questions.
An orienting example: one market, three skills
This original, fictional example uses a Sunday-market mango stall. At RM5 per kg, buyers want 300 kg a day. After a bumper harvest the price falls to RM4 and buyers want 400 kg.
Model skill. The price change moved buyers along the same demand curve. Demand did not shift, because buyers’ wants at each price did not change. The harvest shifted supply.
Data skill. The price fell from RM5 to RM4, which is a change of 1 out of 5, or −20%. Quantity rose from 300 kg to 400 kg, a change of 100 out of 300, or +33.3%. Both percentages use the original figure as the base. The percentage-base explorer shows why swapping the base gives a different answer.
Ratio skill. Dividing the two percentages gives 33.3 ÷ (−20) ≈ −1.67, a measure of how responsive quantity was to price. Your teacher or syllabus may ask for the sign to be handled in a specific way. The ratios tool shows the working and the limits: one fictional market cannot tell you how another market behaves.
Judging skill. A careful sentence says: “In this market, a 20% price fall was followed by a 33.3% rise in quantity, which suggests buyers respond strongly to price, assuming nothing else changed.” That last phrase is the assumption, and it is worth a mark.
In what order should you study the topics?
This is the order we suggest. You can skip what you already do well. Every module has lessons, a practice set and explained answers.
- Scarcity, choice and opportunity cost: the language every other topic uses, so start here.
- Specialisation and allocation: how economies decide who makes what, with the limits of each model.
- Demand relationships: movements along a curve versus shifts, the most commonly confused pair.
- Supply and equilibrium: how the two sides meet, and what happens when one of them changes.
- Elasticity: percentage changes, the right base and what a value means.
- Market failure concepts: where the market model leaves something out, explained without choosing a political side.
- Money, banking and households: the everyday side of the subject, from exchange to budgets.
- Labour and wages: supply and demand applied to work and pay.
- Firms, costs and scale: costs, revenue, profit and what changes as a firm grows.
- Market structures: how competition shapes a firm’s choices.
- Output, growth and living standards: moving from one market to the whole economy.
- Inflation and unemployment: price levels, index numbers and different kinds of unemployment.
- Public finance and economic instruments: budgets, taxes and interest rates, described by mechanism.
- Development, population and environment: indicators, people and resources, read with their limits.
- International trade and exchange rates: currencies, trade effects and barriers.
- Economics data responses: turning tables and text into balanced written analysis, which draws on all the topics above.
If you prefer a planned route with checkpoints, the study route page shows how to build one from the correct syllabus, and the revision guide covers revising from real gaps.
How should you study Economics?
The habits below make the biggest difference.
Draw, then say. After you draw a diagram, say in one sentence what moved, why, and what happens next. If you cannot, the diagram is decoration.
Keep a base list. Every percentage has a starting figure. Write it beside the calculation so the question’s wording decides it, not habit.
Write “because” chains. A good explanation reads: A happens, which causes B, which leads to C. Check that no link is missing.
Attempt before reading. Try the question, then compare with the explanation. The original practice sets are built for this.
Keep fact and opinion apart. When you read an article or data extract, mark what is evidence, what is the writer’s view and what is your own interpretation.
The terminology page clears up confusing pairs such as cost and price, or saving and investment.
Where do students usually get stuck?
- Shift or movement? Students move a curve when only the price changed. See the clinic on this.
- The wrong base. Percentage changes calculated from the new figure. See the clinic on percentage bases.
- A missing step. A chain of reasoning that jumps over an assumption. See the clinic on causal chains.
- Describing, not relating. A graph is described but never tied to the question. See that clinic.
- Overconfident conclusions. A verdict stronger than the evidence. See that clinic.
- Not knowing which guidance applies. See the clinic on exam-year guidance.
What does individual tuition add?
Self-study covers the content well. What it cannot do is watch you think. A one-to-one teacher can see which step of your reasoning slips, ask you to redo it and notice whether the fix holds on a fresh question.
If you want to see how that looks, read about online one-to-one Economics tuition, which includes an original worked example. If you are deciding whether tuition suits you, the considering tuition guide compares it fairly with self-study and group classes.