How the Strait of Hormuz Became the Most Expensive Chokepoint in the World
U.S. and Israeli military operations against Iran beginning February 28 triggered the largest oil supply disruption in recorded history. Here is the full economic accounting of what it cost.
What Happened
On February 28, 2026, U.S. and Israeli forces launched coordinated military strikes against Iran. The operation killed Iran's Supreme Leader Ali Khamenei and multiple senior military officials within the first 72 hours. Iran's response was calculated: retaliatory missile strikes against U.S. bases across the Middle East including Jordan, the UAE, and Qatar, and, most consequentially, a declaration that the Strait of Hormuz was closed to commercial traffic as of March 4. The Strait of Hormuz is a navigational chokepoint through which roughly 20 million barrels of crude oil and petroleum products transit daily, approximately 20% of global oil trade. An additional 25% of global liquefied natural gas trade passes through the same channel, primarily from Qatar and the UAE. The International Energy Agency characterized Iran's closure as "the largest supply disruption in the history of the global oil market." The 1973 Arab oil embargo reduced global supply by approximately 4.4 million barrels per day. The Iran war disruption, at its peak, reduced Middle East production and export flows by more than 11 million barrels per day.
Brent crude jumped 8% in the two trading sessions immediately after military operations began, rising from $71.32 on February 27 to $77.24 on March 2. By March 9, oil surged past $100 per barrel for the first time since 2022, and peaked above $119 in April. As of late June, Brent trades near $77 per barrel on optimism about a Strait of Hormuz peace framework, but the energy system has not fully normalized.
The Economic Cascade
The transmission from the Strait closure to the global economy ran through five distinct channels. The most immediate was energy prices: the World Bank's April Commodity Markets Outlook projected energy prices rising 24% for full-year 2026, the largest annual energy price shock since Russia's invasion of Ukraine. The second channel was fertilizer costs: roughly 25% of global urea production, a key nitrogen fertilizer, is produced in the Gulf states and Iran. The Strait closure disrupted those exports, contributing to a projected 31% increase in fertilizer prices for 2026. Higher fertilizer costs hit food production with a lag of one to two growing seasons. The World Bank estimated that 45 million additional people could face acute food insecurity if the disruption proves prolonged. Third, shipping and insurance costs spiked: shipping rates on routes bypassing the Gulf jumped 40-60% in the weeks after closure. Fourth, the conflict hit Gulf aviation, flights out of Dubai were reduced by two-thirds, those out of Doha by three-quarters. Fifth, and most systemically, the shock arrived at exactly the moment the U.S. was already dealing with tariff-driven inflation and an uncertain monetary policy transition.
The Inflationary Impact and the Fed's Impossible Position
Academic research from CEPR quantified the inflationary impact of the oil price shock. Even in the most optimistic scenario, a one-quarter closure followed by gradual resumption, the surge in energy prices was projected to raise U.S. headline inflation by 0.6 percentage points and core inflation by 0.2 percentage points in 2026. The Fed's June 2026 SEP revised the 2026 headline PCE inflation forecast to 3.6%, up from 2.7% in March, a 0.9-percentage-point upward revision driven primarily by energy and energy pass-through effects. This put the Fed in the classic stagflation bind: it cannot lower rates to support an economy absorbing supply shocks without risking re-accelerating energy-driven inflation. It cannot raise rates to fight inflation without tightening credit into a slowdown. Kevin Warsh's first FOMC meeting held rates at 3.50-3.75% while the dot plot shifted to project a possible hike by year-end, a hawkish signal that bond markets interpreted as the Fed choosing inflation fighting over growth support.
Where Things Stand
The U.S.-Iran ceasefire framework signed in mid-June 2026 has provided market optimism about Strait of Hormuz reopening, and Brent crude has fallen back to the mid-$70s range from its April peak above $119. But the peace framework is fragile, and commercial shipping traffic has not fully resumed as insurance underwriters continue to apply war-risk premiums. The Pentagon's operational cost through May 2026 was $29 billion. The Iran war has been the defining macro event of 2026, and its aftershocks in energy markets, food prices, monetary policy, and geopolitical alignment will continue for years.