September 29, 2026 — Global markets are facing renewed inflation concerns as the Reserve Bank of Australia (RBA) raises its policy rate by 25 basis points to 4.60%, while tighter copper supply adds another potential source of pressure on input costs. Although economic activity and some interest-sensitive sectors have cooled, inflation remains stronger than expected, limiting the room for a rapid shift toward easier monetary policy. At the same time, higher energy prices and AI-related demand are adding complexity to the global inflation outlook.
These developments highlight a broader market question: whether inflationary pressures can continue to moderate while economic growth slows. For investors and traders, the interaction between commodity prices, central-bank policy and bond yields could become increasingly important for understanding liquidity conditions and the valuation of risk assets.
RBA Raises Rates to 4.60% as Inflation Remains Elevated
The Reserve Bank of Australia raised its policy rate by 25 basis points to 4.60%, extending the global focus on persistent inflation and the limits of monetary policy easing.
Although Australian consumption and the housing market have cooled, economic conditions have remained more resilient than expected. Inflation has also remained elevated, making it more difficult for policymakers to move quickly toward lower interest rates.
Meanwhile, developments outside Australia are adding to the broader inflation challenge. The conflict in the Middle East has pushed up energy prices, while AI-driven demand has contributed to higher prices for technology products. Together, these factors could make it more difficult for central banks to ease monetary policy prematurely if cost pressures remain persistent.
For global markets, the key issue is therefore no longer only whether central banks can begin cutting rates, but how quickly inflationary pressures can ease without another increase in energy and input costs.
Copper Supply Tightness Adds to Commodity Inflation Risks
The commodities market presents another potential source of pressure. Deutsche Bank estimates that copper prices could reach $22,050 per metric ton in the second quarter of 2027 if stockpiling continues to reduce freely available supply.
Expectations surrounding U.S. tariffs have encouraged continued copper stockpiling in the United States, reducing the spot supply available to other regions. This creates an important distinction between reported global inventories and copper that is actually available to buyers in different markets.
If inventories become increasingly concentrated in a particular market, regional spot shortages could push prices higher even without a significant increase in overall demand. This could add to costs for industries that rely heavily on copper, including power-grid expansion, AI data centers and manufacturing.
The $22,050-per-ton estimate represents an extreme scenario rather than a base-case forecast. The eventual price path will also depend on future stockpiling, mine supply, demand growth and the ability of producers and consumers to respond to tighter market conditions.
How Energy and Commodity Costs Could Affect Global Markets
The RBA's rate decision and the copper supply outlook point to a similar transmission mechanism across financial markets: higher input costs can slow the decline in inflation, while higher interest rates increase financing costs.
If energy and industrial commodity prices remain elevated, central banks may have less room to reduce policy rates. At the same time, companies facing higher financing and input costs could experience greater pressure on future earnings expectations.
Higher long-term bond yields can further increase the discount rate applied to future earnings, potentially placing additional pressure on asset valuations. This dynamic matters across risk assets because tighter financial conditions can affect liquidity, capital allocation and investor positioning.
For crypto markets, traders may therefore need to monitor the interaction between inflation data, central-bank policy, Treasury yields and commodity prices rather than focusing on a single rate decision.
Key Market Signals to Watch
Going forward, markets could focus on three connected areas:
Energy prices: Sustained increases could keep inflation pressures elevated and limit the pace of monetary easing.
Industrial commodity supply: Copper inventories and the geographic concentration of available supply could provide an indication of renewed input-cost pressure.
Long-term bond yields: Higher yields could signal that markets are reassessing the duration of restrictive monetary policy and its implications for asset valuations.
The broader risk is a combination of slowing economic growth and persistent inflation. If cost-driven inflation remains sticky while financing conditions stay tight, global markets could face a more challenging liquidity environment, potentially constraining valuations across risk assets.
