The Brief

US equities reversed sharply on Monday, with the S&P 500 closing up 0.8% and the Nasdaq surging 1.4%, after President Trump told CBS News the Iran military campaign was “very complete, pretty much.” WTI crude fell more than 6% from session highs above $113 to settle near $85, and Asian markets opened strongly on Tuesday, with South Korea’s KOSPI jumping more than 5% at the open.

The Report

US stocks staged their most dramatic intraday reversal in months on Monday as President Trump’s suggestion that the ten-day-old Iran conflict was approaching its conclusion sent oil prices tumbling and unwound the stagflationary positioning that had gripped markets for over a week.

The S&P 500 closed at 6,796, up 56 points after spending the morning in negative territory. The Nasdaq Composite gained 308 points to finish at 22,696, led by Nvidia, up 2.7%, and Alphabet, up 2.7%. The Dow Jones Industrial Average added 239 points, with Caterpillar the strongest performer at 3.4%. The Russell 2000 climbed 1.1%. Bitcoin rose 5.6% to $70,360.

The reversal was triggered by Trump’s phone interview with CBS News from his Doral golf club, in which he said Iran had “no navy, no communications, no air force” and that the US was well ahead of initial campaign estimates of four to five weeks. Asked whether the war would end this week, Trump said no, but added “very soon.” He also indicated he planned to waive oil-related sanctions.

Oil markets responded immediately. WTI crude, which had spiked above $113 per barrel earlier in the session, fell more than 6% to settle near $85. Brent crude dropped to approximately $88, retreating from levels that had breached $100 for the first time since 2022. Goldman Sachs head of oil research Daan Struyven noted that the risk premium of roughly $14 per barrel corresponded to the bank’s estimate of a full four-week disruption of the Strait of Hormuz, which has seen tanker traffic drop to near zero since Iran’s Revolutionary Guard declared it closed on March 2.

The Treasury market reflected the easing pressure. The 10-year yield fell two basis points to 4.109% after touching an intraday high of 4.22%, as inflation fears receded alongside oil. Gold dropped 2.5% to $5,042 per ounce on profit-taking, while the dollar index held firm near 99.1.

Mohamed El-Erian, Allianz’s chief economic adviser, had warned earlier in the week that the conflict’s “cumulative effect” posed a “fresh potential bout of stagflation” for the global economy, noting the Fed’s “limited” room for manoeuvre with inflation already at 2.9% and job creation at its weakest since the pandemic. Fed Governor Christopher Waller pushed back, saying he did not expect a sustained inflationary impact from the conflict.

Asian markets opened sharply higher on Tuesday. South Korea’s KOSPI, which had fallen more than 16% since the conflict began — reflecting the country’s reliance on Middle Eastern crude for roughly 70% of its supply — jumped more than 5% at the open. Japan’s Nikkei also rallied, recovering from a 10% drawdown over the same period.

Hours after the CBS interview, Trump struck a harder tone at a speech to House Republicans, saying the US would “not relent until the enemy is totally and decisively defeated,” and that he was “considering taking over the Strait of Hormuz.”

The Angle

Markets did not rally on Monday because Trump said something reassuring. Markets rallied because six trillion dollars in global equity losses needed a reason to reverse, and Trump gave them one that was close enough. That the president contradicted himself within hours — “very complete, pretty much” followed by “not relent until totally defeated” — is less interesting than the fact that traders chose the dovish reading and ran with it. When the reversal is that sharp and that fast, what you are watching is not a response to information. It is a liquidity event wearing the costume of a news cycle.

The more structurally revealing fact is what the last ten days exposed about the global energy architecture. The Strait of Hormuz is twenty-one miles wide. A single regional power’s navy, described by the US president himself as effectively destroyed, managed to halt roughly a fifth of the world’s daily oil supply through it. The contingency that energy strategists have modelled for decades turned out to produce almost exactly the disruption everyone predicted, and almost no country had meaningfully prepared for it. South Korea, importing 70% of its crude through the strait. Japan, 90%. Europe, drawing down gas stores that were already thin. The infrastructure of a globalised energy system built on the assumption that this particular corridor would remain open — and when it didn’t, the speed at which the assumption unwound was the story, not the corridor.

Goldman Sachs estimated that if the disruption lasts through March, oil could exceed $147 per barrel — above the 2008 peak. The fact that this estimate exists, from a research desk rather than a think tank, is itself a measure of how narrow the margin has become between the world economy’s operating conditions and its failure conditions. The market celebrated on Monday. What it celebrated was a phone interview from a golf club, offered by a president who gave a different answer at a podium ninety minutes later. The Strait of Hormuz is still effectively closed.