Market alarm as US fails to control biggest debt in history

US Treasuries last week suffered their biggest two-day sell-off since the collapse of Lehman Brothers in September 2008. The borrowing costs of the government of the world’s largest economy have now risen by a quarter over the past four weeks.

Such a sharp rise in US benchmark market interest rates matters a lot – and it matters way beyond America. The US government is now servicing $13.8 trillion (£8.7 trilion) in declared liabilities – making it, by a long way, the world’s largest debtor. Around $414bn of US taxpayers’ money went on sovereign interest payments last year – around 4.5 times the budget of America’s Department of Education.

Debt service costs have reached such astronomical levels even though, over the past year and more, yields have been kept historically and artificially low by “quantitative easing (QE)” – in other words, Federal Reserve Chairman Ben Bernanke’s virtual printing press. Now borrowing costs are 28pc higher than a month ago, with the 10-year Treasury yield reaching 3.33pc last week, an already eye-watering debt service burden can only go up. (more)