Brent Jumped to 91 Dollars After the Interim Iran Deal Quietly Expired

Brent crude rose to 91.08 dollars a barrel on Tuesday after the interim memorandum between Washington and Tehran, signed in June, expired on Monday with nothing to replace it. President Trump said he was not interested in extending it. The barrel is now up 38 percent from a year ago, and up around two and a half dollars in a single day.

That memorandum was never a peace agreement. It was a pause, and it worked well enough that oil spent most of the summer drifting sideways in the high eighties while everyone waited to see whether the pause would harden into something more permanent. It has now simply run out. The market spent the weekend assuming an extension was routine and started Monday finding out it was not.

The talks that matter have moved somewhere else. Iran and Oman are negotiating over the Strait of Hormuz and are apparently making progress, but the United States is not in the room. Washington is unlikely to back any arrangement that does not guarantee unrestricted passage, which leaves the two live negotiating tracks pointed at different outcomes. Meanwhile Middle Eastern producers have become quietly good at moving crude through Hormuz anyway, and at loading cargoes from outside the chokepoint entirely. That workaround is what has kept 91 dollars from being 120.

Everything downstream moved with it. The S&P 500 closed Monday down 0.52 percent at 7,744.97 on the view that expensive oil revives inflation and pulls a Fed rate increase back onto the table before year end. The 30 year Treasury yield topped 5.31 percent, its highest since 2007. Gold added 1.08 percent to 4,422.81 dollars an ounce. Brent itself is up 2.09 percent over the month, which understates how the month actually felt.

The next real marker is whether the Oman channel produces anything Washington can live with. If it does, the risk premium comes out fast. If it does not, the summer's quiet arrangement is over and the market has to price an open ended standoff around a waterway that carries a fifth of the world's seaborne oil. Japan already reported last week that high input costs helped push its capital spending down 1.2 percent.

An expired memorandum is a strange thing to move a market. There was no attack, no announcement, no new sanction. A piece of paper reached its end date and nobody renewed it, and the barrel went up two and a half dollars. Sometimes that is all it takes.