Yeah, it's the US dollar's turn to have a place at the front of the worst currency race and consequently the pound, euro and yen rise against it. But never forget that nothing backs any of them. The foundations that supports them are intangible ones, faith and confidence. Once those disappear we'll have a crack-up boom as people rush to exchange their rapidly depreciating paper.

Some examples here of what happened in Germany between 1919-1923. http://www.bbc.co.uk/education/guides/z89dcwx/revision