Benign neglect may turn the dollar from a safe haven to a dangerous place to be

The trade deficit of the world's biggest economy also remains huge. How much longer can the dollar defy gravity?

Last week, America's currency fell to a 15-month low against the euro, cutting through $1.5050. Against a trade-weighted currency basket, the dollar was also at its weakest since July 2008. The greenback plunged to parity with the rock-solid Swiss franc, then hit a 14-year low against the yen.

The dollar's weakness is based on fundamentals – not least America's jaw-dropping debt. It's a long-term trend. From the start of 2002 until the middle of last year, the dollar lost 30pc on a trade-weighted basis.

It was during the summer and autumn of 2008, though, that the sub-prime debacle entered its most vicious phase (so far). The rescue of Fannie Mae and Freddie Mac, America's quasi-state mortgage-lenders, followed by the Lehman collapse, sent shock waves around the world. For six months or so, Western investors piled into what they knew, liquidating complex positions and buying plain dollars. The greenback became stronger, spiralling upward during the so-called "safe haven rally". (more)