The Reserve Bank of Australia (RBA) is closely watching oil prices for signs that a geopolitical shock could spill into broader inflation, potentially forcing further interest rate increases. In a speech on supply shocks reported by Reuters, RBA Assistant Governor Sarah Hunter warned that while oil spikes create tough trade-offs, they don't reduce the priority of keeping inflation 'low and stable' if inflation expectations start drifting higher.
Brent crude hit $76.38 a barrel on Wednesday following Iran-linked tensions, raising concerns that fuel and transport costs could bleed into the rest of the economy. The RBA has already lifted rates three times this year to 4.35% and held steady in June, signaling that further tightening remains on the table while it watches for broader 'second-round' pass-through effects.
What Is Second-Round Inflation?
Second-round inflation occurs when an initial price shock—like a jump in oil prices—leads workers and companies to expect higher inflation as the new normal. If that happens, wages and prices get reset higher, creating a self-reinforcing cycle that can keep inflation elevated even after the original shock fades.
Hunter noted that the RBA's bigger concern isn't the immediate impact of higher gasoline and shipping costs on household budgets, but whether those costs change inflation expectations. If people start assuming faster inflation is here to stay, they may demand higher wages, and businesses may raise prices more aggressively, embedding higher inflation into the economy.
That dynamic is why central banks often respond to supply shocks with tighter policy, even though such shocks can also slow growth. The RBA's stance reflects this tension: it wants to prevent inflation expectations from drifting up, but it also recognizes that higher energy costs could hit growth and jobs harder than expected, weakening the case for more rate hikes.
Market Pricing Suggests Limited Tightening
Markets are currently pricing only about 15 basis points of additional tightening by year-end, suggesting investors believe the RBA will tread carefully. Hunter's comments underscore that the central bank is watching for signs of broader pass-through before committing to further moves.
The RBA's approach is similar to that of other central banks grappling with supply-driven inflation. The U.S. Federal Reserve has also flagged the risk of second-round effects from energy prices, while the European Central Bank has warned that oil shocks could complicate its fight against inflation.
For Australian borrowers, the key takeaway is that borrowing costs are more sensitive to signs that inflation is spreading beyond fuel than to oil's week-to-week moves. Variable-rate mortgage holders and businesses with floating-rate loans should watch for any uptick in inflation expectations, as that could prompt the RBA to keep policy tighter than markets currently expect.
What It Means for Investors
For everyday investors, the RBA's focus on second-round inflation means that oil prices are not just a commodity story—they are a central bank policy story. If Brent crude stays elevated and starts feeding into broader price expectations, Australian interest rates could stay higher for longer, weighing on growth and corporate earnings.
That dynamic is already playing out in global markets. Oil Jumps 2.7% After US Strikes Iran, Stocks and Bonds Wobble on Inflation Fears highlights how geopolitical tensions can ripple through financial markets. Similarly, Australian Stocks Set to Slip as Oil Surge on Strait of Hormuz Attacks Stirs Inflation Fears shows how local equities are reacting to the same pressures.
Investors should also keep an eye on inflation expectations data, both in Australia and globally. US Inflation Expectations Rise to 3.7% as Treasury Yields Climb and US Consumer Inflation Expectations Tick Up Again in June, New York Fed Survey Shows illustrate how expectations are drifting higher in the world's largest economy, a trend that could influence the RBA's thinking.
For now, the RBA is in a wait-and-see mode. Hunter's speech makes clear that the central bank is prepared to act if second-round effects materialize, but it is also mindful of the growth risks. That balancing act means Australian interest rates could remain volatile, with implications for everything from mortgage payments to stock market valuations.
