Last week, President-elect Barack Obama duly unveiled his American recovery and reinvestment plan. Its title was aptly chosen, for Mr Obama spoke, astonishingly, as if the policies of the rest of the world had no bearing on the fate of the US. He spoke, too, as if a large fiscal stimulus would be enough to restore prosperity. If that is what he believes, Mr Obama is in for a shock. The difficulties he confronts are much deeper and more global than that.