- Lead. The Bureau of Labor Statistics reported on September 11 that US consumer prices rose 0.4% in August, matching forecasts and keeping the annual rate at 3.4%.
- Fact. Gasoline accounted for more than one-third of the monthly increase, surging 3.9% — a direct consequence of oil prices climbing above $100 a barrel amid the US-Iran conflict.
- Stake. Traders responded by raising the probability of a Fed rate hike at the September 16 FOMC meeting to 69%, putting a move to the 3.75%–4.00% range as the most likely outcome.
What Drove August Prices
Energy was the dominant force. The energy index rose 2.1% in August after falling 1.5% in July, with gasoline up 3.9% on the month and 27.4% above year-ago levels. West Texas Intermediate crude has climbed more than 52% since the US-Iran war began in late February, and that increase is now flowing through to pump prices with a lag that held down the July print before reasserting itself in August.
Core CPI — which strips out food and energy — rose 0.3% on the month, one-tenth of a percentage point above most estimates, pulling the annual core rate to 2.4%. Shelter, the largest component of core CPI, rose 0.3% after two consecutive monthly increases of 0.1% and now sits 3.0% above year-ago levels, down from 3.2% in July. The rent trend continues to move in the right direction, but not fast enough to offset energy’s push upward.
Food prices rose 0.2% on the month, modest by the standards of the past two years but still adding to household strain when combined with the gasoline spike.
The Federal Reserve’s Position
The report arrives two days before the FOMC begins its two-day meeting, giving policymakers essentially no new macroeconomic data before they vote. Fed Chair Kevin Warsh signalled at the Jackson Hole symposium in late August that September was “finely balanced,” but the subsequent release of a strong August jobs report — nonfarm payrolls rose 162,000, tripling estimates — shifted the balance toward action.
August CPI has now landed roughly in line with those expectations: not hot enough to force an emergency response, but persistent enough to preclude the case for patience that a cooler reading might have made. The core rate edging to 2.4% is not enough of a win to excuse inaction when the headline rate is being held up by energy costs that the Fed cannot control but that feed into inflation expectations.
Markets are pricing the funds rate at 3.75%–4.00% after Wednesday’s decision, with a minority of participants holding out for a hold. The dot plot — the committee’s quarterly summary of economic projections — will likely show further tightening on the horizon if energy prices remain elevated through year-end.
The Longer Inflation Story
August’s print extends a pattern that has frustrated policymakers since the conflict in the Middle East began. Headline CPI fell in June and July as oil prices initially stabilised, offering a brief window in which the Fed chose to hold. The August reading, while not an acceleration in annual terms, closes that window.
The ECB raised its deposit rate by 25 basis points to 2.5% at its September 10 meeting for precisely the same reason: Eurozone headline inflation hit 3.3% in August, driven by energy. Both central banks are now tightening into a growth environment that is slowing but has not yet tipped into recession — a narrow path that leaves little room for misjudgment on either side.