Australia is waiting for another Reserve Bank interest-rate decision. But there is an uncomfortable reality behind the intense focus on the RBA: many of the forces pushing Australian prices higher are beyond the central bank's control.

The Reserve Bank of Australia can change interest rates.

It cannot reopen the Strait of Hormuz.

It cannot produce cheaper oil.

It cannot increase the number of houses available tomorrow.

It cannot reduce international shipping costs.

It cannot manufacture more electricity.

It cannot prevent wars.

And it cannot make food cheaper after drought, flood or other supply disruptions.

Yet when these forces contribute to Australian inflation, the RBA is expected to respond.

That is the dilemma confronting Australia as the Monetary Policy Board concludes its August meeting.

The cash rate currently stands at 4.35 per cent following three increases earlier this year and a decision to hold in June.

Australia now awaits the next decision.

What can the RBA actually control?

The RBA's principal inflation-fighting instrument is remarkably simple.

Interest rates.

Increase the cash rate and borrowing becomes more expensive.

Mortgage repayments rise.

Businesses face higher financing costs.

Consumers have less disposable income.

Saving becomes relatively more attractive.

Investment can slow.

Demand throughout the economy eventually weakens.

Lower demand should, in turn, reduce pressure on prices.

It is a powerful mechanism.

But it is also an extraordinarily broad one.

The RBA cannot specifically reduce the price of petrol.

Instead, it can make a household's mortgage more expensive so that household has less money available to spend elsewhere.

That distinction is increasingly important.

Australia's inflation problem isn't coming from one source

Inflation is often discussed as though it were a single disease requiring a single medicine.

It isn't.

Prices can rise because consumers are spending too much.

They can rise because businesses face higher costs.

They can rise because supply is constrained.

They can rise because governments change taxes, subsidies or regulations.

They can rise because energy becomes more expensive.

And they can rise because events thousands of kilometres away alter the price of internationally traded commodities.

Interest rates are much better suited to addressing some forms of inflation than others.

Fuel is the obvious example

Australia's exposure to international oil markets has become painfully apparent during the Middle East conflict.

Petrol and diesel are not discretionary luxuries for much of the economy.

A truck needs fuel to deliver food.

A farmer needs diesel to operate machinery.

A tradesperson needs fuel to reach a building site.

A courier needs fuel to deliver parcels.

An airline needs aviation fuel.

A family living in regional Australia may have little practical alternative to driving.

Higher fuel prices therefore behave almost like a tax imposed upon economic activity.

Money spent filling a tank cannot simultaneously be spent at a restaurant, retailer or other business.

And fuel costs do not remain at the petrol station.

They travel.

Fuel becomes part of the price of almost everything

Australia is a large country with long supply chains.

Goods move enormous distances by road.

When transport costs rise, businesses eventually have to decide whether to absorb the additional cost or pass it to customers.

A supermarket product may have travelled through several stages of a supply chain before reaching the shelf.

Raw materials move.

Finished products move.

Warehouses require deliveries.

Stores require deliveries.

Customers travel to buy goods.

Fuel therefore becomes embedded throughout the economy.

The RBA can respond to the inflationary consequences.

It cannot determine the world oil price that caused them.

The RBA itself recognises the problem of external shocks

The Reserve Bank has spent much of 2026 dealing with precisely this difficulty.

The Middle East conflict and associated energy shock have increased inflation risks while simultaneously threatening economic growth.

That combination is particularly troublesome for a central bank.

Ordinarily, weaker economic growth would argue for lower interest rates.

Higher inflation argues for higher rates.

When an external supply shock produces both at the same time, monetary policy becomes a balancing exercise.

Raise rates too aggressively and the RBA risks unnecessarily weakening an economy already being damaged by higher energy costs.

Do too little and temporary price increases could become embedded in wages, expectations and broader inflation.

Neither choice is painless.

Housing provides another contradiction

Interest rates are also being used against inflation while Australia's housing market is showing signs of cooling.

Higher mortgage rates reduce the amount buyers can borrow.

That puts downward pressure on purchasing power.

Existing borrowers have less disposable income.

Developers face higher financing costs.

Investors reconsider projects.

The irony is that Australia simultaneously needs more housing supply.

If financing new housing becomes less attractive or more expensive, monetary tightening can work against the longer-term objective of increasing supply.

Housing demonstrates why inflation management cannot simply be reduced to the proposition that higher interest rates equal lower prices.

The transmission mechanisms are considerably more complicated.

Housing inflation is not simply house prices

There is another important distinction.

Falling or subdued property prices do not necessarily mean housing stops contributing to inflation.

The CPI housing category incorporates expenses including rents, new dwelling costs and electricity.

A house can become cheaper to buy while the cost of living in one continues to rise.

That distinction matters when Australians look at a subdued property market and wonder why inflation remains elevated.

Asset prices and consumer prices are different things.

Electricity is another problem interest rates cannot directly solve

Energy prices provide another illustration.

An interest-rate increase cannot build generation capacity.

It cannot construct transmission infrastructure.

It cannot restore an electricity rebate.

It cannot increase gas supply.

It can suppress demand elsewhere in the economy to compensate for inflation created by those costs.

That may sometimes be necessary.

But Australians should understand the mechanism.

The RBA is often treating the economic consequences rather than the original cause.

Global inflation comes through Australia's front door

Australia is an open trading economy.

We import machinery.

Vehicles.

Electronics.

Fuel.

Industrial components.

Consumer goods.

Pharmaceutical products.

And countless inputs used by Australian businesses.

International commodity prices, shipping costs, wars, tariffs, currencies and supply disruptions can therefore become Australian inflation.

The Australian dollar also matters.

A weaker dollar makes many imports more expensive.

A stronger dollar can reduce those pressures.

Again, the RBA has influence through interest rates and financial markets.

It does not control the underlying international events.

So why increase interest rates at all?

Because doing nothing carries risks too.

This is the other side of the argument.

A temporary increase in petrol prices is one thing.

A general belief that prices will continue rising rapidly is another.

If workers demand substantially higher wages because they expect inflation to persist, businesses can face higher costs.

If businesses expect their suppliers to increase prices, they may increase their own prices pre-emptively.

Inflation can spread from the original shock throughout the economy.

Economists call this second-round inflation.

Preventing that process is one of the reasons central banks react to supply shocks even though they cannot eliminate their source.

The RBA is trying to stop an external price shock from becoming permanent domestic inflation.

Mortgage holders become the shock absorbers

There is nevertheless an uncomfortable distributional consequence.

Monetary policy does not affect everyone equally.

A household with a large variable-rate mortgage can experience hundreds or thousands of dollars of additional annual interest expense after rate increases.

A household without debt may experience little direct impact.

A saver can actually benefit from higher deposit rates.

This means one section of the population bears a disproportionately large share of Australia's inflation-fighting effort.

Mortgage holders are effectively among the economy's principal shock absorbers.

That is one reason every RBA decision generates such intense public attention.

Businesses pay as well

Higher rates do not stop with households.

Businesses borrowing to purchase equipment, finance stock, develop property or fund expansion face higher costs.

Projects that made financial sense at lower interest rates can become unviable.

Investment can be postponed.

Hiring can slow.

Eventually employment can weaken.

That is not an accidental side effect.

Reducing economic demand is part of how monetary policy works.

The difficulty is calibrating how much economic pain is necessary.

Today's decision is therefore bigger than 25 basis points

Financial markets naturally focus on whether the RBA raises, cuts or holds.

But the more important information may be contained in the reasoning accompanying today's decision and the new Statement on Monetary Policy.

What does the RBA believe is happening to inflation?

How persistent does it think the energy shock will be?

How much evidence is there that higher fuel costs are spreading into other prices?

How weak is housing becoming?

How resilient is household spending?

What is happening to employment?

And does the Bank believe its three rate increases earlier this year have done enough?

Those questions tell Australians much more about the economic direction than the headline cash-rate number alone.

Australia faces a monetary-policy paradox

The RBA is required to maintain price stability and full employment.

At present, some of the forces threatening those objectives originate outside Australia.

Higher fuel prices can simultaneously increase inflation and reduce household spending.

Higher business costs can raise prices while reducing investment.

Global instability can weaken economic confidence while increasing the price of essential commodities.

Using higher interest rates against that combination can reduce inflationary pressure.

It can also amplify the economic slowdown.

That is why today's decision is difficult.

The Times View

The Reserve Bank should be held accountable for the decisions it controls.

It should not be credited with powers it does not possess.

The RBA can influence Australian demand and prevent temporary price shocks from becoming entrenched inflation.

It cannot control wars, oil markets, international freight, global commodity prices or many of the supply constraints affecting Australian households and businesses.

Fuel is perhaps the clearest example.

Higher fuel prices remove money from households, increase business costs and push through supply chains. Raising mortgage rates cannot make a barrel of oil cheaper.

Sometimes the RBA may nevertheless need to increase rates to prevent that initial shock spreading into persistent inflation.

That is the uncomfortable distinction.

Australia is waiting for the Reserve Bank's decision.

But perhaps we should also be asking a bigger question:

How much of Australia's inflation problem can monetary policy reasonably be expected to solve?