What you'll learn
This revision guide covers the essential aspects of money and banking within the Microeconomic Decision Makers section of the CIE IGCSE Economics syllabus. You'll understand the functions of money, the role of commercial and central banks, and how the banking sector influences economic activity. These notes provide the knowledge required to confidently tackle exam questions on this topic.
Key terms and definitions
Money — anything widely accepted as payment for goods and services and in settlement of debts
Barter — the direct exchange of goods and services without using money as a medium of exchange
Commercial banks — financial institutions that accept deposits from customers and provide loans and other financial services to individuals and businesses
Central bank — the government institution responsible for controlling the money supply, maintaining financial stability, and acting as banker to the government and commercial banks
Interest rate — the cost of borrowing money or the reward for saving, expressed as a percentage of the amount borrowed or saved
Liquidity — the ease with which an asset can be converted into cash without loss of value
Double coincidence of wants — the situation in a barter economy where two people must each want what the other is offering for an exchange to occur
Reserve ratio — the proportion of deposits that commercial banks must keep in liquid form rather than lending out
Core concepts
The functions of money
Money performs four essential functions in a modern economy:
Medium of exchange Money allows goods and services to be traded without the need for barter. This eliminates the problem of the double coincidence of wants, making transactions faster and more efficient. A teacher can sell their labour for money, then use that money to buy groceries without needing to find a grocer who wants teaching services.
Measure of value (unit of account) Money provides a common unit for measuring and comparing the value of different goods and services. Instead of knowing how many loaves of bread equal one pair of shoes, prices in pounds sterling or US dollars allow instant comparisons. This simplifies decision-making for consumers and businesses.
Store of value Money can be saved and used to purchase goods and services in the future. Unlike perishable goods such as food, money maintains its value over time (though inflation can erode this). Workers can save their wages to make large purchases later rather than spending immediately.
Standard for deferred payment Money allows debts to be created and settled in the future. This function enables borrowing and lending, making possible transactions like mortgages, business loans, and hire purchase agreements. The debtor knows exactly how much must be repaid in monetary terms.
Characteristics of good money
For money to perform its functions effectively, it should possess certain qualities:
- Acceptable — widely recognized and trusted by people in transactions
- Portable — easy to carry and transport for transactions
- Durable — able to withstand wear and tear from repeated use
- Divisible — can be broken into smaller units for transactions of different values
- Scarce — limited in supply to maintain value
- Recognizable — difficult to counterfeit and easy to identify as genuine
Modern currencies like the pound sterling meet these characteristics through coins, banknotes, and increasingly, digital money in bank accounts.
Types of money
Cash (notes and coins) Physical currency issued by central banks and government mints. Cash provides immediate payment and complete anonymity but carries risks of theft and loss. It represents only a small proportion of total money supply in developed economies.
Bank deposits (digital/electronic money) The majority of money exists as electronic records in bank accounts. This includes current account balances and money held in deposit accounts. Digital money facilitates large transactions, online payments, and international transfers but requires banking infrastructure and trust in financial institutions.
Near money Assets that can be quickly converted to cash with minimal loss of value, such as savings accounts or short-term government bonds. While not directly spendable, these highly liquid assets provide security and earn interest.
The role of commercial banks
Commercial banks are profit-seeking financial institutions that perform vital functions in the economy:
Accepting deposits Banks provide safe storage for customers' money in current accounts (for everyday transactions) and deposit/savings accounts (for longer-term storage earning interest). This service protects money from theft and loss while keeping it accessible.
Providing loans Banks lend money to individuals (personal loans, mortgages, overdrafts) and businesses (commercial loans, investment finance). They charge interest rates higher than those paid to savers, earning profit from the difference (the interest margin). This lending supports consumption, investment, and economic growth.
Facilitating payments Banks enable customers to make payments through debit cards, credit cards, direct debits, standing orders, and online banking. These services make transactions more convenient than using cash and allow instant transfers domestically and internationally.
Offering financial services Beyond basic banking, commercial banks provide foreign exchange, financial advice, insurance products, and investment services. These additional services generate fee income and meet diverse customer needs.
Credit creation (the money multiplier) When banks receive deposits, they keep only a fraction as reserves (the reserve ratio) and lend the remainder. When these loans are deposited in other accounts, those banks can lend most of that money again. This process multiplies the initial deposit throughout the banking system, expanding the total money supply beyond the original amount of cash deposited.
For example, if the reserve ratio is 10% and someone deposits £1,000, the bank keeps £100 and lends £900. If that £900 is deposited elsewhere, that bank keeps £90 and lends £810, and so on. The total money created can be calculated using the formula: initial deposit × (1/reserve ratio).
The role of the central bank
The central bank operates differently from commercial banks, focusing on economic stability rather than profit:
Banker to the government The central bank manages the government's bank accounts, handles its receipts and payments, and arranges government borrowing through issuing bonds. In the UK, the Bank of England performs this function; in many Caribbean nations, each country has its own central bank or shares one through regional arrangements.
Banker to commercial banks Commercial banks hold accounts at the central bank and can borrow from it during temporary shortages of cash (acting as "lender of last resort"). This prevents bank failures from spreading through the financial system, maintaining confidence in banking.
Issuing currency Central banks have the sole authority to issue banknotes (and sometimes coins) in the domestic currency. This monopoly helps control the money supply and prevents counterfeiting. The Bank of England issues pound sterling notes; Eastern Caribbean Central Bank issues Eastern Caribbean dollars for several Caribbean nations.
Managing the national debt The central bank organizes government borrowing by issuing bonds and managing repayments. It ensures the government can finance budget deficits without disrupting financial markets.
Controlling the money supply Through various tools, central banks influence the amount of money circulating in the economy. The primary method is adjusting the base interest rate (Bank Rate in the UK), which influences all other interest rates in the economy. Raising rates makes borrowing more expensive and saving more attractive, reducing money supply growth. Lowering rates has the opposite effect.
Maintaining financial stability Central banks supervise commercial banks to ensure they operate safely, hold adequate reserves, and don't take excessive risks. This regulation protects depositors and prevents financial crises. They also intervene during banking panics to maintain confidence.
Managing foreign exchange reserves Central banks hold gold and foreign currencies to support the domestic currency's value and facilitate international payments. These reserves can be used to influence exchange rates through buying or selling domestic currency on foreign exchange markets.
Worked examples
Example 1: Functions of money (4 marks)
Question: Explain two problems that would occur if an economy used barter instead of money.
Model answer: One problem would be the need for a double coincidence of wants [1 mark]. This means both parties in a transaction must want what the other has to offer, which makes trade very difficult and time-consuming [1 mark]. For example, a farmer wanting shoes must find a shoemaker who wants farm produce at that exact moment.
A second problem is the difficulty of storing value [1 mark]. Many goods used in barter, such as food or livestock, deteriorate over time or are costly to store, making it hard to save for future purchases [1 mark].
Examiner note: This answer identifies two distinct problems, provides clear explanations, and includes a relevant example. Each problem earns 2 marks (identification + development).
Example 2: Commercial banks (6 marks)
Question: Analyse how commercial banks contribute to economic activity.
Model answer: Commercial banks provide loans to businesses and consumers [1 mark], which enables firms to invest in capital equipment and expand production, while households can purchase expensive items like houses and cars [1 mark]. This increases aggregate demand and stimulates economic growth [1 mark].
Banks also facilitate payments through services like debit cards and online banking [1 mark]. This makes transactions quicker and more convenient compared to cash, encouraging more frequent economic activity [1 mark].
Furthermore, through credit creation, banks multiply the money supply [1 mark]. When they lend out deposits, keeping only a fraction in reserve, the same initial deposit generates multiple loans throughout the banking system, expanding the availability of money for transactions and investment.
Examiner note: "Analyse" requires explanation of causes, effects, and relationships. This answer shows how banking activities lead to economic consequences with clear analytical chains.
Example 3: Central bank interest rates (8 marks)
Question: Discuss whether raising interest rates is an effective way for a central bank to control inflation.
Model answer: Raising interest rates can be effective in controlling inflation. Higher interest rates increase the cost of borrowing [1 mark], which discourages consumers from taking loans for spending and businesses from borrowing for investment [1 mark]. This reduces aggregate demand, lowering pressure on prices [1 mark]. Additionally, higher interest rates make saving more attractive [1 mark], as savers receive better returns, further reducing spending in the economy [1 mark].
However, there are limitations to this policy. Interest rate changes take time to affect the economy (time lags) [1 mark], so inflation may continue rising in the short term before the policy works [1 mark]. Furthermore, if inflation is caused by supply-side factors like rising oil prices rather than excess demand [1 mark], reducing demand through higher interest rates won't address the root cause and may unnecessarily slow economic growth.
Examiner note: "Discuss" requires arguments on both sides and ideally a conclusion. This answer presents benefits and limitations with developed explanations throughout.
Common mistakes and how to avoid them
Confusing commercial and central banks — Remember that commercial banks are profit-seeking businesses serving customers, while central banks are government institutions managing the economy. Don't write about central banks accepting deposits from the public or commercial banks setting interest rates for the whole economy.
Describing only one or two functions when asked to "explain the functions of money" — Money has four distinct functions. In exam questions worth 4+ marks, you should cover multiple functions with explanations, not just list them.
Failing to explain the credit creation process properly — Don't just say "banks create money." Explain that banks lend out most deposits while keeping reserves, and these loans become new deposits elsewhere, multiplying the original amount through the banking system.
Writing that interest rates only affect borrowing — Remember that interest rate changes also affect saving (higher rates encourage saving, lower rates discourage it) and the exchange rate. Consider multiple effects in analysis questions.
Assuming cash is the main form of money — In developed economies, the majority of money exists as electronic bank deposits. Cash is important but represents a small fraction of the total money supply.
Not linking bank activities to broader economic impacts — When discussing what banks do, connect their activities to economic outcomes like growth, investment, consumption, or stability, particularly in "analyse" and "discuss" questions.
Exam technique for "Microeconomic Decision Makers: Money and Banking"
Command word precision — "Define" requires only a clear meaning (1-2 marks); "Explain" needs identification plus development with examples or reasoning (2 marks per point); "Analyse" requires chains of reasoning showing causes and effects (typically 6 marks); "Discuss" or "Evaluate" needs balanced arguments with supporting evidence (typically 8+ marks).
Structure analysis answers using chains of reasoning — Use connective phrases like "This means that...", "As a result...", "This leads to..." to show economic relationships. For example: "Higher interest rates increase borrowing costs → consumers take fewer loans → consumer spending falls → aggregate demand decreases → inflationary pressure reduces."
Apply knowledge to the context given — If a question mentions a specific country, type of bank, or economic situation, tailor your answer accordingly. Generic answers that ignore the question context lose marks.
In evaluation questions, consider short-term versus long-term effects, different stakeholder perspectives, or circumstances where policies may/may not work — This demonstrates higher-level thinking worth the most marks.
Quick revision summary
Money functions as a medium of exchange, measure of value, store of value, and standard for deferred payment, solving problems of barter. Commercial banks accept deposits, provide loans, facilitate payments, and create credit through the money multiplier process. Central banks issue currency, act as banker to government and commercial banks, control money supply primarily through interest rate adjustments, maintain financial stability through regulation, and manage foreign exchange reserves. Understanding the distinct roles of these institutions and how they influence economic activity is essential for exam success.