Global Economy Braces as Strait of Hormuz Closure Pushes Inflation Higher

The closure of the Strait of Hormuz has tipped the global economy into its most uncertain phase in three years, with the International Monetary Fund warning that inflation will tick up in 2026 and growth will fall well short of pre-conflict projections. The disruption, triggered by the military conflict that engulfed the Middle East at the end of February, has reshaped the policy calculus for governments and central banks across every major economy.

Background and Context

The Strait of Hormuz is the single most important chokepoint in the global energy system, with roughly a fifth of the world's oil shipments and a similar share of liquefied natural gas passing through its narrow waters each day. Any sustained disruption to traffic in the strait has historically been treated as a worst-case scenario by energy planners, and the events of recent weeks have moved that scenario from theoretical risk to operational reality.

The conflict, which began in late February, has already inflicted substantial humanitarian costs and damaged critical infrastructure across the region. Maritime and air traffic have been severely curtailed. Insurance premiums on tankers operating in the Gulf have surged, and several shipping companies have suspended routes entirely while they reassess the security picture. For background on how earlier energy shocks shaped policy, see our coverage of recent moves in global commodity markets.

For the global economy, the immediate transmission mechanism is straightforward. Higher commodity prices feed quickly into headline inflation, which in turn unsettles inflation expectations that central banks had only just begun to bring back under control after the post-pandemic surge.

What Is Actually Happening

The IMF's April 2026 World Economic Outlook now projects global growth of 3.1% for the year, down from a pre-conflict forecast of 3.4%. Headline inflation is expected to climb to 4.4%, a sharp departure from the disinflationary trend that characterised the past two years. Officials at the fund describe the figures as a reference forecast based on the assumption of a short-lived conflict and a moderate 19% rise in energy commodity prices over the year.

Adverse scenarios are considerably more troubling. If the strait remains closed for an extended period and damage to drilling and refining facilities deepens, the IMF warns growth could fall to 2.5% with inflation rising to 5.4%. A severe scenario, in which energy supply dislocations extend into 2027 and inflation expectations become unanchored, would see global growth decline to 2% with inflation exceeding 6%.

The pressures are not evenly distributed. Emerging market and developing economies, particularly commodity importers with existing fiscal vulnerabilities, are bearing the brunt of the shock. The fund's analysis suggests that countries entering the conflict with elevated debt burdens and limited monetary policy buffers face the most difficult adjustment ahead.

At the United Nations, diplomats from dozens of countries have demanded the reopening of the strait, though a resolution to that effect was blocked by China and Russia earlier this week. The UN Secretary-General has warned of a global food emergency, citing surging fuel and fertiliser costs and what officials describe as the worst supply chain disruption since the early stages of the Ukraine war.

Competing Perspectives

The response from major economies reveals the fault lines that have been deepening in the international system for several years. The United States, which has positioned itself at the centre of the diplomatic and military response, has rejected an Iranian proposal to reopen the strait in exchange for a postponement of nuclear talks. European governments have been more measured, with several openly questioning the strategic logic of an extended military confrontation.

The German chancellor has been particularly vocal, prompting a public response from Washington that included a suggestion the United States may reduce its military presence in Germany. Industry groups across Europe have warned that the diplomatic rift risks compounding the economic damage from the conflict itself, with manufacturers in energy-intensive sectors most exposed to a prolonged disruption. Our earlier piece on shifting transatlantic dynamics explores this trend in more depth.

Central banks are split on the appropriate response. Some officials argue that the inflation impulse from energy prices should be looked through, since it represents a one-off supply shock rather than persistent demand pressure. Others, particularly in economies where wage-setting is sensitive to headline inflation, warn that a passive approach risks a repeat of the policy mistakes of the early 2020s, when central banks were criticised for moving too slowly.

The Alverno Alpha Analysis

What is being underplayed in much of the coverage is the structural significance of this moment for the post-Cold War economic order. For three decades, the assumption that energy would flow reliably from the Gulf to consumers in Europe and Asia has been a foundation of global supply chains, manufacturing strategy, and macroeconomic policy. That assumption is now openly in question, and the response from companies and governments will shape investment decisions for years to come.

The IMF's reference forecast assumes the conflict will be short-lived. That assumption is doing a great deal of analytical work. If the strait remains closed for months rather than weeks, the secondary effects, including rerouted shipping, shifts in long-term supply contracts, and accelerated investment in alternative energy sources, will compound in ways that econometric models tend to capture poorly. The most consequential effects of the current shock may not appear in the 2026 figures at all.

There is also a less-discussed political dimension. The fund notes that scaling up defence spending in response to geopolitical tensions can boost short-term activity but risks crowding out social spending and igniting public discontent. With several major economies already running fiscal deficits that look unsustainable in any environment, the pressure to choose between guns and butter is going to become acute. How that choice is managed politically may end up mattering more than the energy price path itself.

Markets to watch in the coming weeks include the next round of central bank meetings, the May 13 reopening of the UK Parliament, and any progress in the stalled Washington-Tehran channel. The shape of the next quarter will be set by whether the strait reopens, on what terms, and at what cost to the credibility of the institutions involved.