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4.3. Monetary policy

Syllabus
0455–2027–2028
Topic
4.3
Level
—

Define money supply and monetary policy

Money supply is the total quantity of money available within an economy. Monetary policy is the use of changes in interest rates, the money supply or the foreign exchange rate to influence total demand and help achieve government macroeconomic aims.

Term What it identifies
money supply the economy-wide stock of money available for payments, saving and lending
monetary policy decisions that change monetary conditions and therefore spending, saving, borrowing and trade

Classify a policy by its instrument, not merely by its aim. Changing an interest rate, money supply or exchange rate is monetary policy; changing taxation or government spending is fiscal policy. The institution making the decision can differ between countries, so the instrument is the safer identifier.

Trace the three monetary policy measures

A monetary policy measure changes the incentive or capacity to spend. An expansionary change tends to increase total demand; a contractionary change tends to reduce it.

Measure Expansionary direction Contractionary direction First links in the mechanism
interest rate decrease increase borrowing becomes cheaper/dearer and saving less/more attractive, changing consumption and investment
money supply increase decrease banks and households have more/less liquidity, influencing lending and spending
foreign exchange rate depreciation appreciation exports become cheaper/dearer to foreign buyers while imports become dearer/cheaper domestically, changing net exports

For example: a higher interest rate raises the cost of loans and the reward from saving → households may borrow and spend less and firms may invest less → total demand may fall. A lower rate reverses these incentives, although weak confidence can reduce the response.

A direction does not guarantee the final result. Exchange-rate effects depend on how strongly buyers respond to price changes and may take time; interest-rate effects depend on confidence, debt and access to credit.

Evaluate monetary policy against macroeconomic aims

Monetary policy affects macroeconomic aims through total demand, borrowing, saving, investment and net exports. The same policy can improve one aim while making another harder to achieve.

Policy stance Likely benefits Likely costs or conflicts
expansionary: lower interest rate, greater money supply or currency depreciation may raise consumption, investment, net exports, real output and employment stronger demand may raise inflation; dearer imports after depreciation may also raise costs and prices
contractionary: higher interest rate, smaller money supply or currency appreciation may reduce demand-pull inflation; appreciation lowers import prices weaker consumption, investment or exports may slow growth and increase unemployment; appreciation can reduce export competitiveness

The size of the effect depends on spare productive capacity, consumer and business confidence, existing debt, commercial-bank lending, responsiveness to interest and exchange-rate changes, and time lags. With much spare capacity, expansionary policy may raise output and employment before causing much inflation; near full capacity, price pressure is more likely.

A sound judgement therefore names the aim, traces the chosen instrument through its mechanism, identifies the likely trade-off, and states the condition that determines how large or certain the effect is. Monetary policy may enable an aim; it cannot guarantee it.