As the Nobel Prize committee was voting one way on Barack Obama's promise for the world's future, the global marketplace was holding a very different vote on America's future. The Norwegian Nobel Committee awarded the US President the peace prize for 2009 for having "created a new climate in international politics", the citation said, in part. Yet, at the same time, the world's foreign exchanges have been busy reassessing the climate in international realpolitik. The US dollar is falling sharply against currencies around the world. Since March it has lost 9 per cent of its value against the yen, 17...