The selloff in US government bonds has found its own engine
A selloff driven by the mechanics of hedging rather than by news stops only when rates stop rising, which is the one thing it prevents.
The interest rate the US government pays to borrow for ten years ended September at 5.3%, up more than half a percentage point in the month, the worst month for these bonds in four years, and touched 5.33% on Thursday morning, a level last seen in 2002. The rate for thirty years is 5.67%. US government bonds are a $32tn market and the reference point for the price of almost everything else, and it has, in the words of JPMorgan Asset Management's Priya Misra, had a 'vicious loop' take hold: 'No one wants to step in front of the freight train.' Rates move most months on some piece of news. What is happening here does not need news.
What makes this week different from last is that the selling now has a named mechanical engine. AllianceBernstein's head of trading, Matthew Scott, told the FT that the big forced sellers are hedge funds and listed firms that borrow to own mortgage bonds (mortgage REITs). As mortgage rates rise, homeowners stop refinancing, so the bonds backed by those mortgages pay off more slowly and in effect become longer-term debt. A holder who had protected himself against a seven-year bond now owns something closer to a ten-year one, and he fixes that by selling government IOUs that do not come due for twenty or thirty years. That pushes rates up, which stretches the mortgages further, which forces more selling. The trade has a name, convexity hedging, and it does not read inflation data: inflation, measured by PCE, came in at 3.4% on Wednesday against a 3.7% forecast, the kind of surprise that would ordinarily send bond prices up, and it did nothing.
The things that were supposed to lean against this are not. The Treasury Department, which borrows the money the government spends, raised the cap on its buyback of its own bonds in August to $6bn from $2bn, but has been taking around half of what sellers offer and falling short of the cap in each recent operation, apparently because it thinks the prices asked are too high. ING's Padhraic Garvey says it is 'perfectly entitled' to decline; Jefferies' Thomas Simons says anyone who really needed to raise cash 'will give an aggressive offer in'. Both are true, and both mean the backstop is a buyer at a price of its own choosing, not a buyer.
What it costs to be a forced seller in a market like this is visible in the bonds sold by US states and cities. Nuveen put its entire $190m holding of bankrupt Brightline's senior bonds up for an all-or-nothing sale on Monday, days after the company filed for Chapter 11, and sold at 45 cents on the dollar. Diameter, Redwood and FourSixThree bought it. Two days later the bonds traded at 55. That gap is the price of having to sell today, and it is why this is an ignition story: a selloff that forces people to sell stops only when rates stop rising, and rising rates are what it produces.