The Price Ratchet the Iran War Built

For eight weeks, American drivers watched gas prices fall. By late June, the brief US-Iran ceasefire had done what central banks could not: it broke the inflation fever, if only for a moment. Consumer confidence ticked up 0.6 points to 91.2 — still below the prior year's 95.2, but moving in the right direction ^[1]. Then, on July 10, the ceasefire collapsed. Within days, gas jumped 10 cents to $3.82 a gallon, with regional spikes as sharp as 26.5 cents in Columbus, Ohio ^[2]. By July 23, oil had hit $94 a barrel and gas reached $4.06 ^[3]. The relief was gone. This is the whipsaw. And it is not a bug of the Iran war's economic fallout — it is the feature. The mechanism that makes this loop durable was identified, with unusual clarity, by Reserve Bank of New Zealand Chief Economist Paul Conway ^[4].

the conflict has still delivered another significant inflation shock and the challenge for monetary policy is to ensure that this doesn’t lead to persistent inflation. — Paul Conway

Conway was describing New Zealand, but the dynamic is general. Each oil-price spike from a Strait of Hormuz disruption embeds itself in the cost structure of everything that moves — food, fertilizer, freight — while each ceasefire dip fails to reverse those increases. The result is a ratchet: prices climb in steps, and the steps only go one way. The evidence of this ratchet is hiding in plain sight beneath a series of relief stories that, on inspection, were never about relief at all. Take Ofgem's announcement in June that the typical UK household energy bill would fall by £190 to £1,709. The headline looked like a price cut. It was not.

a risk that headline bill figures could be misinterpreted as indicating falling prices, when in reality they reflect less consumption — Ofgem

The "cut" came from lowering the assumed gas consumption benchmark from 11,500 kilowatt-hours to 9,500 — a revision to how much energy the regulator assumes a household uses, not to what it costs per unit. Actual unit rates rose ^[5]. Or take Aldi's widely reported price cuts on groceries — three consecutive quarters of reductions. The move was real, but its cause was not supply-chain healing. Aldi was executing a market-share strategy, using operational efficiency to undercut competitors at a moment when shoppers were desperate for cheaper food ^[6]. It was a business tactic, not a signal that the underlying cost pressures had eased. China, meanwhile, appeared to have broken the loop entirely: consumer inflation slowed to 1% in June, and state oil firms posted record profits ^[7][8]. But the mechanism that insulated Chinese consumers — state-mandated fuel-price caps and a halt to fuel exports — is unavailable to governments that do not control energy markets directly. Beijing could order PetroChina and Sinopec to absorb the cost of higher crude; London and Washington cannot. Beneath these mirages, the structural damage has been accumulating. Gas prices remain roughly 40% above pre-war levels ^[9]. The World Bank forecasts a 30.7% global fertilizer price increase for 2026, driven by natural gas disruptions from the Gulf ^[10]. In Texas, nitrogen fertilizer prices are already up 34%, and 70% of US farmers surveyed by the American Farm Bureau Federation say they cannot afford the fertilizer they need ^[11]. These are not prices that fall when a ceasefire holds for three weeks. And the inflation has not stayed in energy. It has metastasized. The transmission to food is the most direct: UK greenhouse growers face gas price increases of 90%, and the Food and Drink Federation forecasts UK food inflation of at least 9% by year-end ^[12]. British potato growers and fish fryers report that fertilizer and red diesel costs have doubled, with prices expected to climb into 2027 even if the conflict eases ^[13]. From food, the pressure has moved into services. In May, Federal Reserve official Austan Goolsbee issued a warning that cut through the usual central-bank caution ^[14].

Services inflation is the part that I'm nervous about. — Austan Dean Goolsbee

Goolsbee was naming the metastasis: what began as an oil shock was now showing up in prices that have nothing to do with a barrel of crude. And from services, the loop has reached housing. By late July, US 30-year mortgages hit 6.58% and UK two-year fixed deals reached 5.59%, with over 100 UK mortgage products temporarily withdrawn from the market. The Bank of England's Financial Policy Committee projects that five million UK homeowners will face higher repayments by the end of 2028 ^[15]. The institutional consequence of a loop no one can agree how to read is a three-way central bank divergence. The Reserve Bank of Australia has already moved: rates are at 4.1%, with Treasury modeling showing inflation heading toward 5% ^[16]. The RBA treated the energy shock as inflationary from the start and acted accordingly. The Federal Reserve, under new Chair Kevin Warsh, has pivoted hawkish. Half the FOMC now anticipates rate hikes, inflation sits at 4.2%, and Warsh has removed forward guidance in favor of what he calls "just the facts" ^[17]. The April stance of holding steady is gone. And the European Central Bank is split. The divide is not between hawks and doves in the usual sense — it is between two readings of the same data. ECB board member Isabel Schnabel sees persistence ^[9].

The peace deal is still fragile, markets continue to point to higher oil prices over longer horizons and gas prices are still around 40% higher than before the war. — Isabel Schnabel

Belgian governor Pierre Wunsch sees the opposite.

Does the decline in oil prices mean that we are back to the pre-war situation? I don't think so. — Isabel Schnabel

Two central bankers, looking at the same price series, drawing opposite conclusions. The ratchet makes both of them partially right: the shock has vanished from the headlines each time a ceasefire holds, and it has never vanished from the cost structure. Schnabel and Wunsch are not disagreeing about the data. They are disagreeing about which layer of it is real.