The yield on 10-year Treasuries – the benchmark price of global capital – surged 30 basis points in just two days last week to over 3.9pc, the highest level since the Lehman crisis. Alan Greenspan, ex-head of the US Federal Reserve, said the abrupt move may be “the canary in the coal mine”, a warning to Washington that it can no longer borrow with impunity. He said there is a “huge overhang of federal debt, which we have never seen before”. 
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