Iran’s oil spike held US inflation at 3.5% and handed Fed hawks a September argument

American inflation is being kept at its current elevation by a single external shock. When diplomatic negotiations between Washington and Tehran collapsed, crude oil prices climbed more than 20 percent in a single month — and that move showed up in the price of every commute, every grocery delivery, every tank of gas. The consumer price index landed at 3.5 percent year-over-year, unchanged from the prior month.

The gap between a 3.5 percent reading and the 3.4 percent that economists were forecasting might read as a rounding error. It is not. The trajectory was the point. For months, the path of consumer prices had bent toward something that looked, to a cautious Federal Reserve, like enough room to hold rates steady through the end of the year. That trajectory has now flatlined, and the mechanism doing the flattening is one the Fed cannot reach with a policy rate.

Core inflation — which strips out the volatile food and energy components that made the headline sticky — appears to have eased slightly, to around 2.5 percent from 2.6 the prior month. That modest progress was overtaken by the energy move before it had any chance to reshape the committee’s calculus. When crude climbs 20 percent in a single month, it tends to show up in everything from airline tickets to manufactured goods, and its presence in the composite number tends to outlast the diplomatic event that caused it.

Fed Chair Kevin Warsh had already assembled three colleagues prepared to argue for a rate increase at the September meeting. The July CPI print hands that faction a piece of evidence that is difficult to argue against in a committee room: prices have not cooled, and the mechanism doing the heating is beyond monetary policy’s reach. No interest rate decision can coax Iran back to the negotiating table.

The consumer consequence is direct and arithmetic. Average hourly wages in the United States grew at 3.2 percent over the past year — a full 0.3 percentage points below the current inflation rate. Every month at 3.5 percent is another month in which the purchasing power of a typical paycheck contracts in real terms. That applies to 158 million employed Americans regardless of whether the cause is domestic overheating or a foreign oil rupture.

The read that the Fed’s more cautious members will push back with is this: the Iran rupture was sudden, and oil markets have a history of reversing as fast as they moved. Crude climbed 20 percent on diplomatic pessimism. If that pessimism is wrong — if talks restart, as they have before — oil prices could retrace within weeks, and a committee that hiked rates in September in response to a temporary energy spike would have little justification for the damage.

The September FOMC meeting is scheduled for September 16 and 17.

Tags: Federal Reserve, inflation, iran, interest rates, oil prices