Fed Study: US Long-Term Interest Rates To Double

The US deficit has blown out from 3pc to 13.5pc in the past year but long-term rates are largely unchanged. Assuming Mr Laubach’s “typical estimate”, long-term rates have to climb 2.5 percentage points.

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The study is damning because Mr Laubach was the Fed’s economist at the time, going on to become its senior economist between 2005 and 2008, when he stepped down. As a result, the doubling in rates is the US central bank’s own prediction.