This module covers how money works, how banks connect savers and borrowers, and how a household’s income limits its choices. These ideas appear in definition questions, short calculations and scenario answers in IGCSE Economics. Check the current syllabus on the Cambridge subject page for the exact content for your exam year.
What do you need to know first?
You should be comfortable with scarcity and opportunity cost from scarcity, choice and opportunity cost, and with basic percentages. Most calculations here are short: a percentage of an amount, a division to find a quantity, and a subtraction to find a difference.
One orienting example
A fictional household earns RM2,000 a month and spends RM1,600. It saves RM400, which is 20% of income.
The household deposits the RM400 in a bank. The bank keeps 25% as reserves, so 0.25 × 400 = RM100, and lends 400 − 100 = RM300 to a small firm.
The firm uses the loan to buy a machine, which is investment. If the interest rate on loans falls, the firm finds the loan cheaper, so the incentive to borrow rises.
Notice that one story touched saving, investment, a bank’s role and borrowing incentives. The lessons below separate those ideas so you can handle each one on its own.
In what order should you study the lessons?
- Explain a function of money using a concrete exchange: it gives you the vocabulary of the module through one example.
- Distinguish saving from investment: this removes the most common definition error.
- Describe a bank’s role: it shows how deposits become loans and why a bank earns a gap.
- Interpret a household-budget constraint: it turns income and prices into a limit you can calculate.
- Explain a change in borrowing incentives: it combines interest costs and expected gains from stated facts.
What are the common traps?
- Giving a function a verb that belongs to another one, such as calling a purchase “store of value”.
- Using the everyday meaning of “invest” when the exam wants capital spending.
- Writing that a bank keeps all deposits in a vault, instead of describing reserves and lending.
- Shifting a budget line when only one price changed, which should pivot it.
- Bringing outside facts into a scenario question instead of using the stated numbers.
The module also links forward to labour and wages, where income and earnings return in a new setting.
How should you use the practice set?
Work through the lessons first, then attempt the mixed practice set on paper with no notes. The percentage-base explorer and the ratios with interpretation limits tool support the arithmetic. Log any slips in the mistake log and retry them a week later.
Economics answers reward clear reasoning more than recall. Students who stay with the stated facts, show a calculation, and finish with “other things equal” tend to gain the explanation marks. If you want help building that habit on your own work, see online one-to-one Economics tuition.