When Washington sold its war with Iran as a limited use of force, it implied the economic fallout would be manageable. That claim is no longer credible. The most important economic development is not simply that oil prices rose. It is that the shock has moved beyond crude into the products households and businesses actually consume: gasoline, diesel, jet fuel, fertilizer, freight and, eventually, food. That is why this now looks less like a temporary geopolitical spike and more like an inflation tax created by US policy. The International Monetary Fund (IMF) put the point starkly this week: for fuel-importing economies, the de facto closure of the Strait of Hormuz functions like “a large, sudden tax on income,” and “all roads lead to higher prices and slower growth.”
This matters because refined products are where the pain becomes real. Crude prices make headlines, but diesel moves trucks, jet fuel moves passengers, and gasoline hits consumers directly. Reuters reported on March 30 that physical prices for jet fuel, diesel and gasoline in Singapore had surged far more dramatically than crude itself, with jet fuel and gasoil roughly doubling from pre-war levels. EU officials are now explicitly worried about tightening supplies of diesel, jet fuel, and gasoline, and Shell’s chief executive has warned that Europe could face shortages as early as April. That is the kind of shift policymakers fear most: not just expensive oil, but visible scarcity and price pressure in the fuels that shape transport, logistics, and consumer sentiment.
Americans are already feeling it. AAA’s national average for regular gasoline stood at $3.99 per gallon on March 30, up from $2.98 a month earlier. That is not an abstract market move. It is a direct hit to disposable income, and it falls hardest on people who have the least room in their budgets. For years, Washington has acted as though foreign wars can be insulated from domestic economics. But energy does not respect political messaging. A war that disrupts one of the world’s most important chokepoints does not stay “over there.” It arrives at the pump, then moves through delivery costs, airline fares, commuting, farm inputs, and household inflation expectations.
The broader macro picture is turning in the same direction. The OECD now says the Middle East conflict has materially worsened growth and inflation prospects, projecting global growth of 2.9% in 2026 and warning that higher energy prices and supply disruptions are raising costs and lowering demand. It also projects G20 inflation in 2026 to be 1.2 percentage points higher than previously expected, at 4.0%. Germany’s harmonized inflation rate has already accelerated to 2.8%, driven in part by a 7.2% jump in energy prices. This is how a geopolitical shock turns into a monetary-policy problem: higher fuel costs seep into transport, goods prices and inflation expectations, leaving central banks less room to ease and households with less room to spend.
What makes this even harder to defend is that governments are now scrambling to cushion the very damage the war created. The G7 said on Monday that it stands ready to take “all necessary measures” to stabilize energy markets, while supporting the International Energy Agency’s record release of 400 million barrels from strategic reserves. Australia, facing a consumer backlash, has gone further by halving its fuel excise for three months at an estimated fiscal cost of A$2.55 billion. Those are not signs of a successful, well-contained operation. They are signs that policymakers are already trying to socialize the costs of a war they presented as strategically necessary. Even the IEA stresses that its emergency response system exists to mitigate the economic effects of a sudden supply crisis, not to serve as a long-term substitute for sound strategy.
The shock is also spreading beyond energy. The International Food Policy Research Institute (IFPRI) reported that Middle East urea prices were up more than $90 per metric ton in a single week in early March, a 19% jump, while US Gulf DAP prices were up about 5%. In practical terms, that means the war is beginning to push through the agricultural cost chain as well. Fertilizer matters because it is one of the classic second-round channels through which an energy crisis becomes a food-price problem. It raises costs for farmers first, then for consumers later. This is precisely why the IMF warned that low-income countries face growing food insecurity if high energy and fertilizer prices persist.
From a US perspective, the criticism should be straightforward and unsentimental. Washington chose a war that is now making transport fuels scarcer, inflation stickier, and fiscal responses more expensive. It is not enough to say energy markets are volatile anyway. Of course they are. The relevant question is whether US policy made that volatility worse, and whether the supposed strategic gains justify the domestic and global economic costs now plainly visible. So far, the answer looks increasingly negative. The Strait of Hormuz remains severely disrupted, refined-product markets are tighter than crude markets, and governments from Brussels to Canberra are already moving into crisis-management mode. That is not a picture of leverage. It is a picture of economic blowback.
The next phase matters even more than the last month. If the conflict drags on, product shortages will likely move from Asia into Europe more forcefully, freight costs will stay elevated, fertilizer pressures will reach planting seasons, and central banks will face the classic late-cycle dilemma of weaker growth alongside stubborn inflation. The IMF’s warning that “all roads lead to higher prices and slower growth” is not a slogan. It is a sober description of how chokepoint wars spread through an integrated economy. From an American point of view, that is the most damning arithmetic of all. Washington did not just choose a war. It chose a policy path that is now asking households, importers, farmers and consumers to finance its consequences in real time. That is why this conflict should be understood not only as a military gamble, but as an inflation tax of Washington’s own making.
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