Brent crude oil has dropped below $80 a barrel for the first time since the Strait of Hormuz — the world's most important oil passage — was largely shut down in late February by military action. This seems backwards. When a crucial supply line gets cut, you'd expect oil to get more expensive, not cheaper.

Understanding why is useful whether you heat with oil, own energy stocks, or simply want to grasp what's happening in global markets.

The Scale of the Problem

The Strait of Hormuz is narrow — just 33 kilometres across at its tightest point — yet it moves enormous amounts of oil. According to the EIA, roughly 20 million barrels flow through daily. That's about one-fifth of everything the world uses each day. Most of that is carried by oil tankers.

When this route closes, you don't just see higher prices on trading screens. You get actual shortages at refineries. That's why the IEA has warned for years that a prolonged closure would be serious. Since late February, ship traffic through the strait has been severely limited, and vessels are not passing through in normal numbers.

Yet prices have dropped. Why?

Why Prices Fall During a Supply Crunch

Several things can push oil prices down even when supply tightens.

Weaker demand. If traders and companies think a recession is coming — whether caused by the conflict, by trade restrictions, or by higher energy costs rippling through the economy — they expect the world to use less oil. When demand falls faster than supply shrinks, prices go down. It's like a store lowering the price of bread because fewer people are buying.

Emergency stockpiles. The U.S. and other wealthy nations hold strategic oil reserves for exactly this scenario. If governments release oil from storage, they temporarily replace the missing barrels and cap prices, even while the actual supply route stays blocked. This is standard practice in a crisis.

Going around the problem. Major oil producers like Saudi Arabia and the UAE have pipelines that don't use the Strait of Hormuz. They can pump oil through alternative routes instead. This can't replace all the lost volume, but it helps. Oil already on ships or sitting in floating storage (tankers anchored at sea) can also fill the gap temporarily.

Changing expectations. When the conflict started, traders feared it would be severe and long-lasting, so they built a "war premium" into the price. As weeks passed and the situation didn't spiral into something worse, many traders reassessed. They decided the disruption might be contained or brief. When traders change their minds about risk, prices fall — not because the actual problem got better, but because they now think it won't be as bad as they feared.

What Happens If This Drags On

Don't mistake falling prices for safety. The emergency stockpiles are large — about 1.4 billion barrels across wealthier nations — but they're not unlimited. They were designed to cover disruptions lasting weeks, not months. If the Strait of Hormuz stays closed through summer 2026, real problems emerge: higher energy demand in warm months, fewer stockpiled barrels left to draw on, and tanker companies growing reluctant to send ships through dangerous waters. In that scenario, a price under $80 would look disconnected from reality.

Right now, the market is hedging its bets. Traders are simultaneously betting on weak demand pushing prices down and preparing for a supply crisis pushing them up. One of these bets will win out. Which one depends entirely on how long the strait stays closed — and that's a question about geopolitics and military decisions, not financial calculation.