Expansionary versus contractionary policy
Definition
Expansionary (loose) monetary policy: lowering interest rates, expanding the money supply or easing credit to raise aggregate demand.
Contractionary (tight) monetary policy: raising interest rates, contracting the money supply or tightening credit to reduce aggregate demand.
Expansionary policy
- Expansionary policy aims to lift a weak economy out of a negative output gap.
- The central bank cuts interest rates, expands the money supply or eases credit rules.
- Cheaper, more available credit raises consumption and investment.
- Aggregate demand shifts right, so real output and employment rise.
- It is the standard response to recession or below-target inflation.
Contractionary policy
- Contractionary policy aims to slow an overheating economy.
- The central bank raises interest rates, contracts the money supply or tightens credit rules.
- Dearer, scarcer credit reduces consumption and investment.
- Aggregate demand shifts left, easing demand-pull inflation.
- It is the standard response to inflation above target.
Key Idea
- Expansionary policy shifts AD right; contractionary policy shifts AD left.
- The direction of the interest-rate change signals which one is in use.
Choosing between them
- The choice depends on the economy's position in the trade cycle.
- Rising inflation calls for contraction, while recession and unemployment call for expansion.
- Because policy works with time lags of up to two years, central banks act pre-emptively rather than waiting for the data.
Example
- Suppose the UK is in recession, unemployment is rising and inflation is only 0.5%, below the 2% target.
- The Bank of England chooses expansionary policy and cuts the rate from 3% to 0.5%.
- A household repaying a £180,000 mortgage saves roughly £4,500 a year, freeing income to spend.
- Cheaper borrowing lifts consumption and investment, so aggregate demand shifts right from AD1 to AD2.
- Real output and employment recover as firms expand to meet demand.
- Had inflation instead been climbing above target the bank would have raised the rate and shifted AD left, so the choice depends entirely on the macro problem.
Exam technique
- State the direction of the rate change and the direction of the AD shift together.
- Match the policy to the macroeconomic problem in the question.
- Mention time lags when evaluating how effective the policy is.
Common Mistake
- Do not muddle the labels; expansionary means lower rates, not higher.
- Contractionary policy raises rates to cool demand.
- Do not assume expansionary policy always works; weak confidence and lags can blunt it.
Self review
- Define expansionary monetary policy.
- Which way does a contractionary policy shift aggregate demand?
- When would a central bank use contractionary policy?
- Why do time lags matter for monetary policy?
- What kind of inflation does contractionary policy target?
