Brent Crude fell $12.25 — 10.9% — to close at $99.94 per barrel, its first settlement below $100 since 11 March and a 14% intraday swing — the largest single-day oil price drop since the war began. WTI fell 10.3% to $88.13. European gas futures dropped 9%. The trigger: Trump's Truth Social post claiming productive conversations with Iran and postponing strikes on Iranian power plants for five days.
Four days earlier, Brent had peaked at $126 . The swing from peak to Monday's close — roughly 21% in under a week — occurred with no change in the physical supply picture. The Strait of Hormuz remains under IRGC operational control. The 8-million-barrel-per-day supply disruption documented by the IEA has not eased. More than 3,000 vessels remain stranded across the Middle East . UBS economist Paul Donovan attributed the volatility to "different and at times contradictory assessments of the war" from senior US officials 1 — a diagnosis that applies with equal force to the $126 peak, which was driven by Trump's 48-hour strike ultimatum .
Even after Monday's drop, Brent at $99.94 sits roughly 50% above the pre-war price of $67.41. American households still pay an additional $300 million per day at the pump compared to pre-conflict levels . Goldman Sachs's Daan Struyven had raised US recession probability to 25% at lower price levels than Monday's settlement ; Oxford Economics assessed that sustained Brent at $140 triggers a mild global recession at negative 0.7% GDP .
Monday's market priced in a diplomatic resolution that does not yet exist. Iran denies negotiations have occurred. If the proposed Islamabad meeting fails to materialise, or if Trump's five-day postponement expires on 28 March without progress, the conditions that produced $126 remain intact — and the snap-back would be equally abrupt.
