A narrow waterway separating Iran from the Arabian Peninsula carries roughly one-fifth of the world’s daily oil supply. About 21 million barrels pass through the Strait of Hormuz every single day. If that chokepoint were disrupted — even partially — the consequences wouldn’t just ripple through energy markets. They’d detonate across the entire global economy.
That scenario, once relegated to the fringes of geopolitical risk modeling, has moved uncomfortably close to the center of serious policy discussion. And the people sounding the alarm aren’t fringe commentators. They’re the chief economists at the world’s most influential financial institutions.
Pierre-Olivier Gourinchas, the IMF’s chief economist, laid out the math in stark terms during a recent interview with Business Insider. A full blockade of the Strait of Hormuz could send oil prices surging by $25 a barrel almost overnight. That kind of supply shock, Gourinchas warned, would add roughly one percentage point to global inflation — a figure that sounds modest in isolation but would land like a sledgehammer on central banks already struggling to bring price growth back to target.
“This is the type of shock that monetary policy is not well-equipped to handle,” Gourinchas told the publication. He described it as a classic supply-side disruption: output falls, prices rise, and policymakers face the impossible choice between tightening into a slowdown or letting inflation run hot.
The timing makes this particularly dangerous. The Trump administration has escalated its pressure campaign against Iran, reimposing sweeping sanctions and signaling a willingness to use military force to prevent Tehran from advancing its nuclear program. Iran, for its part, has repeatedly threatened to close the strait if its oil exports are choked off entirely. Neither side appears interested in de-escalation.
Consider what’s already happened. Oil prices have been volatile throughout early 2025, buffeted by conflicting signals — OPEC+ production adjustments, weakening Chinese demand, and the persistent uncertainty around U.S. trade policy. Brent crude has hovered in the low-to-mid $70s per barrel for much of the year, a range that’s neither comfortable for producers nor alarming for consumers. But that relative calm masks enormous fragility.
The International Energy Agency has been tracking the risk closely. In its most recent oil market report, the IEA noted that geopolitical supply risks remain “elevated” and that any disruption to flows through the Strait of Hormuz would be exceptionally difficult to offset through strategic petroleum reserves or alternative routing. There simply isn’t enough spare pipeline capacity to reroute millions of barrels per day around the Persian Gulf. The infrastructure doesn’t exist.
What makes the Hormuz scenario so devastating isn’t just the volume of oil at stake. It’s the concentration. Saudi Arabia, Iraq, Kuwait, the UAE, and Qatar all depend on the strait for the vast majority of their hydrocarbon exports. A blockade wouldn’t just affect crude oil — it would simultaneously disrupt liquefied natural gas shipments, refined product flows, and petrochemical feedstocks. The cascade effects would hit manufacturing supply chains in Asia, heating fuel supplies in Europe, and gasoline prices in the United States within days.
Not weeks. Days.
Gourinchas emphasized to Business Insider that the $25 per barrel estimate is a central-case scenario, not a worst case. A prolonged closure, or one accompanied by military conflict in the region, could push prices far higher. During the 1979 Iranian Revolution and the subsequent Iran-Iraq war, oil prices more than doubled in real terms. The 1990 Iraqi invasion of Kuwait produced a similar spike. Modern markets are faster and more interconnected, which means the initial shock would be more violent even if the duration were shorter.
The Federal Reserve would face an agonizing dilemma. Chair Jerome Powell has spent the better part of two years trying to engineer a soft landing for the U.S. economy, and a Hormuz-driven oil spike would complicate that effort enormously. Higher energy prices function as a tax on consumers and businesses alike. They push up headline inflation, erode purchasing power, and drag on growth — all at the same time. The textbook response is to “look through” a temporary supply shock and keep policy steady. But if the shock persists for more than a few months, inflation expectations could become unanchored, forcing the Fed into rate hikes even as the economy weakens.
Stagflation. The word that keeps central bankers up at night.
European policymakers would face an even more acute version of the same problem. The eurozone’s energy dependence on imported hydrocarbons remains substantial despite years of investment in renewables and efficiency. The European Central Bank, which only recently began cutting rates after its own prolonged inflation fight, would likely have to reverse course if energy prices surged. That would hammer an already fragile recovery in Germany and weigh on growth across the continent.
China, the world’s largest oil importer, would absorb the shock differently but no less painfully. Beijing has built substantial strategic petroleum reserves — estimated at over 900 million barrels — but even that buffer would be strained by a prolonged disruption. More critically, a price spike would undermine China’s efforts to stimulate domestic demand at a moment when deflation, not inflation, has been the primary economic concern. The People’s Bank of China has been easing monetary policy to support growth; an energy price shock would force a rapid reassessment.
And then there’s the trade war overlay. The Trump administration’s tariff policies have already introduced significant friction into global commerce. Adding an energy shock on top of trade barriers would create a compounding effect that economic models struggle to capture fully. Supply chains that have been rerouted to avoid tariffs would face simultaneous cost increases from higher energy prices. Margins that are already thin would evaporate.
Some analysts argue the market is already partially pricing in the risk. Options markets show elevated demand for upside protection on crude oil, suggesting that at least some institutional investors are hedging against a supply disruption. But the broader equity market appears remarkably sanguine. The S&P 500 has shown little sustained reaction to escalating U.S.-Iran tensions, and implied volatility in energy-sensitive sectors remains moderate by historical standards.
That complacency is itself a risk factor. When markets aren’t positioned for a tail event, the repricing tends to be violent and disorderly. The 2022 Russian invasion of Ukraine demonstrated this dynamic vividly — Brent crude jumped from around $90 to nearly $130 per barrel in a matter of weeks, catching many institutional portfolios off guard and triggering margin calls across commodity trading desks.
A Hormuz disruption would be worse. Significantly worse. Russia’s oil exports were never fully cut off; they were rerouted to willing buyers in India and China at discounted prices. A physical blockade of the strait, by contrast, would remove barrels from the market entirely. There’s no rerouting around a closed waterway.
The military dimension adds another layer of uncertainty. The U.S. Fifth Fleet is based in Bahrain, just miles from the strait, and maintains a permanent naval presence in the Persian Gulf precisely to ensure freedom of navigation. Iran, meanwhile, has invested heavily in asymmetric warfare capabilities — fast attack boats, anti-ship missiles, and naval mines — designed to threaten commercial shipping in confined waters. A military confrontation wouldn’t just close the strait temporarily; it could render it uninsurable for commercial tankers for an extended period, effectively achieving a blockade even after hostilities ceased.
Insurance matters enormously in global shipping. During the 2019 tanker attacks in the Gulf of Oman, war risk premiums for vessels transiting the region spiked by a factor of ten. Several major shipping companies temporarily suspended transits altogether. A more serious confrontation would likely produce a far more dramatic response from underwriters, potentially shutting down commercial traffic through the strait even without a formal military blockade.
So what can policymakers do? The honest answer: not much, at least in the short term. Strategic petroleum reserves provide a buffer, but they’re designed to manage temporary disruptions, not prolonged supply cuts. The United States holds approximately 400 million barrels in the SPR after drawdowns in 2022, enough to replace lost Hormuz flows for roughly three weeks. Coordinated releases from IEA member countries could extend that window, but not indefinitely.
Longer term, the Hormuz vulnerability strengthens the case for energy diversification — more domestic production, faster deployment of alternatives, and reduced dependence on any single supply corridor. But those are multi-year investments. They don’t help if the strait closes next month.
Gourinchas’s warning to Business Insider carries extra weight precisely because the IMF doesn’t typically engage in geopolitical speculation. When the fund’s chief economist publicly models a scenario involving a $25 oil price spike and a one-percentage-point inflation surge, it signals that internal risk assessments have shifted. The fund is telling the world to pay attention.
Whether the world listens is another matter entirely. Markets have a well-documented tendency to ignore low-probability, high-impact events until they actually occur. The Strait of Hormuz has been a theoretical flashpoint for decades without ever being fully closed. That track record breeds complacency. But the current combination of escalating U.S.-Iran tensions, aggressive sanctions enforcement, and explicit military threats from both sides represents a qualitative shift in the risk profile.
The $25 question isn’t whether a Hormuz disruption would be devastating. Everyone agrees it would. The question is whether anyone in a position of power is taking the risk seriously enough to prevent it — or at least to prepare for it. Right now, the evidence on both counts is thin.
Oil traders have a saying: the market takes the stairs up and the elevator down. A Hormuz crisis wouldn’t be an elevator. It would be a trapdoor.
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