Australian shares slipped on Monday as weakness in iron ore and copper weighed on mining giants, while investors positioned for a likely interest rate hike from the Reserve Bank of Australia (RBA) this week. The S&P/ASX 200 fell 0.2%, with the materials sector bearing the brunt of the selling.
Miners dropped 1.5% as iron ore and copper prices weakened, pulling down heavyweights BHP and Rio Tinto. Gold stocks also slid after bullion touched a one-year low, and even defensive consumer-staples names lost ground. The broad-based decline was partly offset by a rise in financials, which gained 0.5% after Westpac, one of Australia's 'big four' banks, reported a small lift in full-year profit despite softer mortgage demand.
Why miners are under pressure
The drop in mining stocks reflects a broader cooling in commodity prices. Iron ore, a key export for Australia, has been sensitive to demand signals from China, the world's largest steel producer. Recent data showed China's factory activity slipping back into contraction, which typically dampens expectations for steel and iron ore demand. Copper, often seen as a bellwether for global economic health, has also been under pressure, with copper heading for its first monthly drop since June as worries about AI-driven demand and broader economic uncertainty rattle markets.
For investors, the mining sector's performance is closely tied to commodity prices. When iron ore and copper fall, miners' earnings expectations tend to shrink, and their share prices often follow. That dynamic was on full display today, as BHP and Rio Tinto—two of the ASX's largest companies—dragged the index lower.
The RBA decision looms
The bigger story for the market is the RBA's upcoming meeting on Tuesday. Inflation remains above the central bank's target, and Governor Michele Bullock has sounded more willing to tighten policy in recent remarks. According to a Reuters report, all but two of 32 economists now expect the cash rate—the RBA's key interest rate—to rise to 4.85%.
Higher rate expectations typically pressure 'rate-sensitive' sectors like technology, where future earnings are less certain and investors discount those profits more heavily when interest rates rise. That's why tech stocks often struggle when rate hike odds increase, even if their underlying business fundamentals haven't changed.
But not every sector takes the hit evenly. Banks often benefit, at least initially, because many Australian home loans have variable rates that reset quickly, while banks tend to raise deposit rates more slowly and by less than the full move. That gap widens net interest margin—essentially the spread between what banks earn on loans and pay on deposits—which can help profits even if credit growth cools.
That's why bank stocks can act like a relative shelter when hike odds rise, while 'long-duration' areas such as tech can struggle. It also means an index dip driven by miners and tech can mask strength in financials when the market is repricing the RBA path.
What it means for investors
For everyday investors, the key takeaway is that a potential rate hike has uneven effects across the market. If the RBA does lift the cash rate to 4.85%, it would be the highest level in over a decade, and that would ripple through borrowing costs for households and businesses. Higher rates can slow economic activity, which is why rate-sensitive sectors like housing and consumer discretionary often feel the pinch.
However, as today's session shows, some sectors can benefit. Banks, for instance, may see improved margins even if loan demand slows. That's why financials rose even as the broader index fell. Investors should be aware that a market dip driven by one sector can hide strength elsewhere, and that diversification across sectors can help manage risk during periods of rate uncertainty.
Looking ahead, all eyes will be on Tuesday's RBA announcement. If the central bank hikes, it will be the first move in this cycle and could signal more to come. If it holds, markets may breathe a sigh of relief. Either way, the decision is likely to set the tone for Australian equities in the coming weeks.
