Monetary Policy

Syllabus: Economic Policies and Management → Monetary policy.

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Purpose of monetary policy

Monetary policy is the Reserve Bank's influence over the cost and availability of credit, exercised through a target for the cash rate, which is the interest rate on unsecured overnight loans between financial institutions in the cash market.

The mandate

The RBA works to a dual mandate, made explicit in the 2023 Statement on the Conduct of Monetary Policy: price stability, meaning inflation of 2 to 3% on average over time, and sustained full employment.

Two pieces of institutional detail signal that you have read something current. The Monetary Policy Board replaced the Reserve Bank Board on 1 March 2025 and meets eight times a year. The quarterly Statement on Monetary Policy is released alongside the February, May, August and November decisions.

The precise wording of the target is worth unpacking, because each part does a job. The band allows for measurement error and shocks. "On average, over time" lets inflation sit outside the band temporarily without forcing a destabilising response. And the target is not zero because a small positive rate guards against deflation.

Independence

The RBA sets the cash rate independently of government, which is what makes the inflation target credible. Credibility is what anchors inflation expectations, and anchoring expectations is most of what monetary policy actually achieves.

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Implementation of monetary policy

The Board announces a target for the cash rate. It does not set mortgage rates or business lending rates directly. It sets the rate at the very short end of the market and relies on transmission through the financial system to do the rest.

The RBA's own framework runs in five steps. The price in this market is the cash rate, the interest rate on overnight interbank loans. The quantity is Exchange Settlement balances, the deposits banks hold at the RBA to settle payments with each other. Demand slopes downward, because banks want ES balances both to make payments and as a store of value. Supply is vertical, determined by the Reserve Bank. And then there is the piece most students have never seen: the policy interest rate corridor, being the two rates the RBA sets around its target.

Rate	August 2026	Role
RBA lending rate (standing facility)	4.60%	ceiling: no bank pays more, because it can borrow from the RBA
Cash rate target	4.35%	the announced policy variable
RBA deposit rate (paid on ES balances)	4.25%	floor: no bank lends below, because it can deposit with the RBA

No bank has any incentive to trade outside that corridor, so announcing a new target moves the whole corridor and the market rate follows it.

An important caveat about domestic market operations

Most textbooks show the RBA moving the cash rate by shifting the supply of ES balances through daily open market operations. That was accurate in the scarce reserves era before 2020, when the Bank supplied just enough ES balances to meet demand, so scarcity determined the price.

It is no longer how the Bank operates. The RBA's own explainer states that it "no longer conducts daily open market operations to manage ES balances". The pandemic response flooded the system with reserves, and once reserves are abundant, adding or removing them barely moves the rate. The cash rate is instead "maintained consistent with the target through the interest rate corridor."

Market operations still happen, but their job has reversed. Following an announcement by Assistant Governor Christopher Kent in March 2024, the RBA has been moving to an ample reserves with full allotment system, effective from April 2025, under which it supplies as many reserves as banks ask for through full-allotment repo auctions priced at a fixed spread above the target.

Deploy this as evaluation rather than as your opening line. Draw the diagram as taught, because that is what the marking guidelines expect. What knowing the change buys you is the ability to distinguish implementation from transmission, which is precisely the distinction NESA's 2025 examiners found candidates blurring.

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Impact of changes in interest rates

The interest rate transmission mechanism

Rehearse this as an arrow chain rather than prose:

Cash rate ↑ → retail lending rates ↑ → mortgage repayments ↑ and cost of business credit ↑ → household discretionary income ↓, investment viability ↓ → C and I ↓ → AD ↓ → demand-side inflationary pressure eases

All of it operating with a lag of 12 to 18 months. Policy set today is aimed at inflation in late 2027, which is why the RBA must act on forecasts rather than on what it can observe, and why the lag is the single most important limitation of the whole instrument.

The other channels

Naming these is what makes a response complete rather than merely correct.

The exchange rate channel needs to stay distinct from the interest rate channel, because merging the two is the specific error the 2025 examiners identified:

Cash rate ↑ → interest rate differential widens in Australia's favour → capital inflow ↑ → demand for AUD ↑ → appreciation → imported inflation ↓, helping price stability, but international competitiveness ↓, worsening the trade balance

The asset price and wealth channel works through valuations. Higher rates lower the present value of housing and shares, which reduces household wealth and the willingness to spend out of it.

The cash flow channel is unusually powerful in Australia, because household indebtedness is high and a large share of mortgages are variable-rate. In economies dominated by fixed-rate mortgages the same rate rise takes far longer to bite.

The expectations channel is the one doing most of the work in 2026. A credible central bank anchors inflation expectations, and those expectations feed directly into wage and price setting.

Impact on economic activity

A rate rise contracts: consumption and investment fall, growth slows, cyclical unemployment rises, inflationary pressure eases, the currency appreciates, asset prices fall. A cut runs the same chain in reverse.

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The 2026 case study

Learn this sequence and you have evidence for every monetary policy question in the paper.

Date	Move	Cash rate
Through 2025	three cuts	4.35% → 3.60%
February 2026	+25bp	3.85%
March 2026	+25bp	4.10%
May 2026	+25bp	4.35%

Conflict in the Middle East drove the reversal by pushing fuel prices sharply higher. Headline inflation spiked to 4.6% over the year to March 2026, and the Board judged that the shock was producing second-round effects, feeding into prices for goods and services more broadly, on top of existing capacity pressure with unemployment at 4.4% against a NAIRU estimate of about 4.6%.

Since then headline inflation has eased to 3.8% over the year to June, but trimmed mean inflation has moved the other way, rising from 3.3% in March to 3.6%. The fuel spike is washing out of the headline figure while the underlying pressure it created has not. The RBA's May 2026 forecasts do not have inflation back at the midpoint until mid-2028.

That divergence is what unlocks the better argument. Most candidates can say monetary policy fights inflation. This episode lets you say that monetary policy is a demand-side instrument confronting a supply-side shock. The Bank is not tightening because demand is booming. It is tightening to stop a temporary shock becoming embedded in expectations, and it is paying for that with falling real wages and per-capita output growth of just 1.0%.

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Strengths and limitations

Monetary policy is flexible and fast to implement, with eight meetings a year and immediate effect, which compares well against the annual Budget cycle. It is insulated from political constraint by an independent central bank, and that independence is what makes it credible enough to anchor expectations. It also works in both directions, as the 2025 easing and the 2026 tightening between them demonstrate.

The limitations are substantial and each needs a mechanism attached, not just a name.

Time lags of 12 to 18 months mean policy is always set against a forecast rather than observed conditions, and forecasts are wrong.

It is blunt. One interest rate applies to the entire economy, so it cannot target the sector generating the pressure, and the burden lands hardest on indebted mortgage holders and interest-sensitive industries.

It is ineffective against supply-side shocks, because no domestic interest rate lowers the world oil price. The most it can do is suppress demand elsewhere to offset the shock.

It depends on transmission actually working. A high share of fixed-rate mortgages, or unusually strong household balance sheets, weakens the pass-through.

It runs into the zero lower bound. Rates cannot fall far below zero, which is why unconventional tools were needed in 2020.

It conflicts with other objectives, since tightening for price stability raises unemployment and slows growth.

And it cannot raise productive capacity at all. Long-run price stability depends on the supply side, which is microeconomic reform's job rather than the RBA's.

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What the exam does with this

Monetary policy is the most examined single policy in the course. It took Section III in 2021, Section IV in 2023, and Section II in 2025.

On the 2025 question examiners reported that responses confused the cash rate mechanism with exchange rate impacts, and used imprecise economic terminology.

Five things to get right.

Define the cash rate precisely as the interest rate on unsecured overnight loans between financial institutions, and name both the Monetary Policy Board and the dual mandate.

Write the transmission chain as steps, and include the lag.

Keep the interest rate and exchange rate channels separate, and say explicitly that they are separate.

Explain limitations with mechanisms. "It has time lags" earns nothing. "The 12 to 18 month impact lag means policy is set against a forecast rather than observed conditions" earns the mark.

Use the 2026 sequence with its dates and figures. Anything citing a 0.1% cash rate or a 2022 peak of 7.8% as current tells the marker your notes stopped two years ago.

For worked responses on this topic, including a full 20/20 essay, see how to answer monetary policy questions.

Related notes: Fiscal policy · Inflation · Exchange rates · The diagram guide