Back in the 1930s, the French government constructed what it thought was an impregnable defence system to prevent a repeat of the German invasion at the start of the first world war. The Maginot Line might have looked impressive but proved to be a white elephant because when the attack came in 1940 it was in a different place altogether.
In the past week the financial markets have displayed something of a Maginot Line mentality. They are right to think there is a threat lurking out there but they are wrong to think the biggest danger is a recession in the US. The real threat comes from elsewhere.