The September consumer price index delivered two numbers — 4.3% on the monthly measure, 3.9% on the quarterly — and the Reserve Bank of Australia chose the scarier one. Markets now price an 87% chance of a rate rise next Tuesday, with a move to 4.85% fully priced in for December. The RBA's inflation mandate has swallowed its employment mandate whole. Strip out petrol and the picture changes materially. Automotive fuel rose 9.4% in September alone, with another 7% increase expected in October. Without fuel prices, annual inflation sits at 3.6% — still above target but not the headline emergency the 4.3% figure implies. Oil prices, stubbornly unresponsive to either rate hikes or geopolitical pronouncements, are doing much of the work here. Around half of September's inflation increase came from fuel. A quieter but structurally interesting driver is the AI datacentre squeeze on consumer electronics. The ABS recorded a 15.5% annual price rise in games, toys and hobbies, driven by memory and storage components being redirected to datacentre demand. Chip scarcity is no longer just a supply-chain story — it is showing up in CPI baskets. The RBA's signaling operation was precise. After September unemployment hit 4.7%, markets dropped rate-rise odds below 20%. Deputy governor Andrew Hauser then told Citigroup investors the inflation outlook was "materially worse" than August projections and warned that businesses normalising 3-3.5% inflation was "the central banker's nightmare." Odds jumped from 22% to 51% overnight and kept climbing. The market was primed before the CPI data landed. Hauser partially walked back his hawkishness at Senate estimates, noting inflation expectations remained "well anchored." But the damage — or the intent — was done. The RBA can now raise rates and point to both the data and market expectations as justification for a move that was, in effect, pre-announced via a fireside chat with institutional investors. Meanwhile, Australia's three-month average unemployment rate has risen 0.45 percentage points over the past year. If October holds at 4.7%, it will breach the 0.5-point Sahm Rule threshold — the marker US economist Claudia Sahm identifies as recession-signal territory. Governor Michele Bullock was direct about the bank's priorities: "We're not worried about the pace of increase in the unemployment rate at this stage." She added unemployment would "probably" need to rise further. The asymmetry is now explicit. A 0.3-percentage-point rise in monthly CPI triggers near-certain rate action. A 0.6-percentage-point rise in unemployment over nine months draws a shrug. The RBA has revealed its loss function, and employment is not the binding constraint.
