What is monetary policy?
Monetary policy is the use of interest rates, the money supply and sometimes the exchange rate to influence total demand in the economy. It is usually carried out by a country’s central bank.
Simple idea: monetary policy affects how easy or expensive it is for people and firms to borrow, save and spend money.
1. Policy instruments of monetary policy
A policy instrument is a tool used by the central bank to influence the economy. The three main instruments are money supply, interest rates and exchange rates.
Money supply
The money supply is the amount of money available in the economy. If the money supply increases, banks may be able to lend more, making borrowing easier.
Example: the central bank may support bank lending so firms can borrow to invest.
Interest rates
Interest rates are the cost of borrowing and the reward for saving. Lower interest rates usually encourage borrowing and spending. Higher interest rates usually encourage saving and reduce borrowing.
Example: lower loan rates may encourage households to buy cars or homes.
Exchange rates
The exchange rate is the value of one currency compared with another. Central banks may influence exchange rates directly or indirectly through interest rates.
Example: higher interest rates may attract foreign money and make the currency stronger.
2. Expansionary and contractionary monetary policy
Monetary policy can be used to stimulate the economy or to slow down the economy. These are called expansionary and contractionary monetary policy.
Expansionary monetary policy
Expansionary monetary policy is used when the government or central bank wants to increase economic activity.
- Interest rates may be reduced.
- The money supply may be increased.
- Borrowing becomes cheaper and easier.
- Consumption and investment may rise.
Likely result: higher spending, higher output, more jobs, but possible inflation if demand rises too much.
Contractionary monetary policy
Contractionary monetary policy is used when the central bank wants to reduce inflationary pressure.
- Interest rates may be increased.
- The money supply may be reduced.
- Borrowing becomes more expensive.
- Consumption and investment may fall.
Likely result: lower spending and lower inflation, but economic growth may slow and unemployment may rise.
3. Effects of monetary policy on macroeconomic aims
Monetary policy affects the main macroeconomic aims because it changes borrowing, saving, spending, investment and sometimes the exchange rate.
| Macroeconomic aim | How monetary policy can affect it |
|---|---|
| Economic growth | Lower interest rates can increase consumption and investment, which may increase output and growth. Higher interest rates may slow growth. |
| Full employment / low unemployment | Expansionary policy can increase demand for goods and services, so firms may hire more workers. Contractionary policy may reduce demand and employment. |
| Stable prices / low inflation | Higher interest rates can reduce spending and help lower inflation. However, very low interest rates may increase inflation if demand rises too quickly. |
| Balance of payments stability | Higher interest rates may strengthen the currency. This can make imports cheaper but exports more expensive. Lower interest rates may weaken the currency and make exports more competitive. |
| Redistribution of income and wealth | Changes in interest rates affect savers and borrowers differently. Higher interest rates help savers but make debt more expensive for borrowers. |
4. Simple cause-and-effect chains
Expansionary chain: lower interest rates → cheaper borrowing → more spending and investment → higher total demand → more output and jobs.
Contractionary chain: higher interest rates → borrowing becomes expensive → less spending and investment → lower total demand → less pressure on prices.
5. Quick revision summary
- Monetary policy is mainly controlled by the central bank.
- The main instruments are money supply, interest rates and exchange rates.
- Expansionary monetary policy encourages borrowing and spending.
- Contractionary monetary policy reduces borrowing and spending.
- Monetary policy can affect growth, employment, inflation, the balance of payments and income distribution.
Easy exam method
When explaining monetary policy, use this pattern:
- Name the measure: expansionary or contractionary.
- State the instrument: interest rates, money supply or exchange rate.
- Explain the effect: borrowing, saving, spending or investment changes.
- Link to the macroeconomic aim: growth, unemployment, inflation or balance of payments.
Example: “If the central bank lowers interest rates, borrowing becomes cheaper. Households and firms may spend and invest more. This can increase economic growth and reduce unemployment.”