But the biggest consequences will be for the biggest borrower — namely the US government. As Greg Ip put it in Thursday’s Wall Street Journal, “Rising Interest Rates Mean Deficits Finally Matter.” It is no coincidence, he argued, that “the recent rise in bond yields came as Fitch Ratings downgraded its US credit rating, Treasury upped the size of its bond auctions, analysts began revising upward this year’s federal deficit, and Congress nearly shut down parts of the government over a failure to pass spending bills.”
US fiscal policy has long been on an unsustainable trajectory — for more than 20 years, in fact. But under President Joe Biden it has jumped the shark. The federal deficit looks like it will exceed 7% of GDP in fiscal 2023, after the Congressional Budget Office adjusts for the vagaries of policy on student debt forgiveness. That is a truly shocking number for an economy that is running at close to full employment. And, as I pointed out here a month ago, there is no scenario the CBO can devise in which the total debt relative to GDP does not keep growing, with spending driven up partly by the rising burden of interest payments.
The key problem, as Brian Riedl of the Manhattan Institute has pointed out, is that the average maturity of the federal debt is just 76 months. So even if the CBO is right, and long-term interest rates average 4% over the next three decades, the result will still be budget deficits rising to 10% of GDP. And each additional percentage point on interest rates would add an additional $2.8 trillion of debt service costs over 10 years.
This disastrous outcome is a perfect illustration of the law of unintended consequences.
“In terms of total returns, this is the biggest bond market rout in 150 years.”https://t.co/ufQO76ioX6 via @opinion
— Bruce Mehlman (@bpmehlman) October 10, 2023