Monetary policy is the Reserve Bank of Australia's (RBA) use of the cash rate to influence economic activity. It is the primary tool of demand management in Australia, and it works by setting the price of money — the interest rate — which then ripples through the economy.
The cash rate and the RBA's objectives
The cash rate is the interest rate on overnight loans between banks; the RBA sets a target for it. Changes flow through to the interest rates households and firms actually pay. The RBA's objectives are the stability of the currency (its 2–3% inflation target, on average over time), full employment, and the economic prosperity and welfare of Australians.
Conventional and unconventional policy
Conventional monetary policy means adjusting the cash-rate target. When the cash rate is already very low (near zero), the RBA may turn to unconventional monetary policy — measures such as quantitative easing (buying government bonds) or forward guidance — to provide further stimulus.
When the RBA changes stance
The RBA tightens (raises the cash rate) when inflation is too high or the economy is overheating, and eases (cuts the cash rate) when growth is weak, unemployment is rising, or inflation is below target.
The transmission mechanism
A cash-rate change does not affect the economy directly — it works through several channels that together move aggregate demand. The diagram traces an easing (a cut):
Stance on the AD/AS model
An expansionary (easing) stance shifts AD right (as in the fiscal lesson); a contractionary (tightening) stance shifts AD left to cool inflation. The mechanism is different, but the AD/AS picture is the same as for fiscal policy.
Strengths and weaknesses
Strengths: decided independently by the RBA board (free of the political cycle), implemented quickly and frequently adjustable, and effective economy-wide. Weaknesses: it works with a long and variable lag (often a year or more); it is a blunt, economy-wide instrument that cannot target regions or sectors; and it loses traction near the zero lower bound, where unconventional measures become necessary.
Trace the mechanism and classify stances together.
Trace the channel
For an easing (a cut), state the effect at each step: cash rate → lending rates → consumption and investment → aggregate demand → output and inflation. Then identify which channel matters most for a heavily indebted, mortgage-holding household.
1. Define the cash rate and explain how a change in it reaches the interest rates households and businesses actually pay.
2. State the economic conditions under which the RBA would (a) ease and (b) tighten monetary policy.
3. Explain the monetary policy transmission mechanism for a cut in the cash rate. Refer to at least three channels and the effect on aggregate demand.
4. Outline two strengths and two weaknesses of monetary policy compared with fiscal policy.
5. Explain what unconventional monetary policy is and when the RBA might use it.
6. Using the AD/AS model, explain how a contractionary monetary stance reduces inflationary pressure.