The spike absorber is 41% full
With the oil buffer nearly empty, an energy shock now has to be answered with interest rates rather than barrels — into the most rate-sensitive debt stock in history.
Brent settled at $94.65 a barrel, up 4.6% on the day, and traded as high as $97.04 into the Asian session on 2 September — a five-week high. We checked both figures. The move follows the first direct exchange of attacks between the US and Iran in a month; on Tuesday only five ships transited the Strait of Hormuz, and European gas hit its highest since March (Guardian). The piece of plumbing worth understanding is what is not available to absorb it. The US Strategic Petroleum Reserve stood at 289.7 million barrels as of 21 August — its lowest since 1982, and about 41% of its authorised 714 million barrel capacity, on Department of Energy data. A further 39 million barrel release is planned. The reserve exists precisely to blunt a Middle East supply shock, and it is close to the level at which drawdowns stop being a policy tool and start being a logistical problem. So the shock passes straight through to prices, and from prices to inflation expectations, and from expectations to the long end. That is the chain that has the 30-year Treasury at 5.27%, gilts at a 28-year high and the 10-year at 4.80%. And it lands on a Fed chaired by Kevin Warsh, who said at Jackson Hole on 28 August that "two percent is a firm and fixed target" and that short-term rates are the primary tool. Futures moved last week towards pricing a hike on 16 September. The two-year at 4.34% against three-month bills at 3.77% says the front end agrees. A tightening cycle restarting into a $40tn federal debt stock is a different regime from the one we have been describing for most of this year.