Rate Rise Decision Making: Does the RBA Watch The Wrong Thing?

When the Reserve Bank holds rates steady, as it did this week at 4.35 per cent, the political machinery moves fast. The Treasurer calls it a "welcome reprieve." Mortgage holders exhale. The financial press runs the scoreboard. What gets almost no attention in any of this is the more consequential question: not what the rate decision was, but what behaviour it is actually producing, and whether that behaviour is doing what the RBA needs it to do.



The cash rate hits three different economies at once

The standard model behind rate decisions runs like this: raise the price of borrowing, households spend less, demand falls, inflation cools. It is a clean mechanism in theory. The problem is that Australian households are not a uniform block. They are split, roughly, into three distinct groups with three distinct relationships to the cash rate: mortgage holders, renters, and asset owners. The rate signal lands differently in each group, and the aggregate effect is messier than the model implies.

Mortgage holders are the most rate-sensitive group, and they know it. When rates rise, their repayments go up within weeks. When rates hold, as they did this week, the relief is real but it is also largely psychological. They remain in a position of elevated financial stress, constrained in discretionary spending, and unlikely to take on new debt. The RBA gets the demand compression it is looking for from this group whether rates rise or hold, because the existing rate level is already doing the work.

Renters are a different story. They hold no variable-rate debt, so the transmission mechanism does not reach them directly. What reaches them is the downstream effect: landlords with mortgages, facing higher holding costs, pass those costs into rent. This is not conjecture. It is the standard competitive response in a market where vacancy rates are already historically low. So the rate mechanism that is supposed to cool demand is, for a significant share of the population, generating cost pressure rather than relieving it. Inflation fighting in one channel, inflation generating in another.

Asset holders are getting a stimulus the model doesn't account for

Asset holders, particularly those with substantial equity in property or financial markets, present the most interesting case. For this group, sustained higher rates have a depressive effect on asset values in theory, but a stimulative effect on savings income in practice. A retiree with substantial term deposits is doing better now than they were when the cash rate sat near zero. Their real income has risen. Their spending capacity has increased. This is not a policy failure, exactly, but it does mean the rate mechanism is providing stimulus to one segment of the population while applying the brakes to another.

The problem the RBA faces is that it has one instrument and a heterogeneous economy. The cash rate cannot be calibrated differently for different household types. It is a single lever that pulls on everything at once, which means the transmission of any rate decision is the net of many contradictory effects, not a single clean signal. This is the structural reality that statements like "a welcome reprieve for Australians with a mortgage" gloss over. Not all Australians are mortgage holders. And of those who are, many are already sufficiently chastened by current rate levels that the marginal effect of a hold versus a rise is smaller than the headline treatment suggests.

Fiscal support can add demand at the same moment monetary policy is trying to remove it

The Treasurer's statement this week points to broader fiscal action, tax cuts, cost of living support, a tighter Budget, as complementary pressure on inflation. That framing is reasonable as far as it goes, but it carries its own behavioural question: fiscal support that flows broadly, regardless of spending behaviour, does not compress demand the way rate rises do. It supplements income. For households that are already credit-constrained, supplemented income may flow directly into consumption, which adds demand rather than removing it.

None of this means the RBA is wrong to hold. It may well be the right call given the global volatility the Treasurer describes, the US-Iran agreement, rising rates in Japan and the Euro area, and an Australian inflation number that is heading in the right direction even if it remains above target. The case for patience is defensible.

What is less defensible is the assumption that the rate level is translating into consistent, predictable, demand-reducing behaviour across the economy as a whole. The gap between what a rate decision signals and what it actually produces in household behaviour is large, and it is not uniform. The RBA is steering with a wheel that does not have the same grip on every part of the road.

That is the part the press conference never quite gets to.

Frequently Asked Questions

Why doesn't the RBA cash rate affect all Australians the same way?
Australian households fall into three groups with very different relationships to the cash rate: mortgage holders, renters, and asset owners. Rate rises directly increase costs for mortgage holders, generate downstream rent increases for tenants through landlord cost pass-through, and simultaneously increase savings income for asset-heavy households — meaning the same rate setting is applying a brake to some Australians and a stimulus to others.

Does holding interest rates steady actually reduce inflation?
Holding rates steady maintains demand compression on mortgage holders who are already financially stressed, so the RBA continues to get the spending restraint it needs from that group. However, the article argues that other groups — particularly renters facing higher rents and asset owners enjoying higher savings returns — are less affected or even stimulated, meaning the aggregate demand-reducing effect is weaker and less uniform than the standard model assumes.

How do rent increases relate to RBA rate decisions?
When the RBA raises the cash rate, landlords with variable-rate mortgages face higher holding costs and pass those costs into rents, particularly in a market with historically low vacancy rates. This means the rate mechanism intended to cool inflation is generating additional cost pressure for renters, who make up roughly 30 per cent of Australian households.

Can government cost of living support cancel out what the RBA is doing on inflation?
The article raises this concern directly: broad fiscal support — tax cuts, energy rebates, cost of living payments — supplements household income regardless of spending behaviour. For credit-constrained households, that additional income may flow straight into consumption, adding demand at the same moment the RBA is trying to remove it.

Why do some economists say the RBA is using the wrong tool to fight inflation?
The critique is that the cash rate is a single instrument applied to a heterogeneous economy — it cannot be targeted at the households or sectors actually driving inflation. If current inflation is concentrated in services, housing, and insurance rather than in the discretionary spending of mortgage holders, then rate rises are compressing the wrong demand while leaving the inflationary pressure largely intact.