With Greece out of the spotlight, global investors have returned to worrying about a future rise in US interest rates and the volatility that could bring to markets. They appear to be supremely unconcerned by the stagnation in world trade this year. But that could turn out to be a costly mistake.

The latest World Trade Monitor showed the volume of world trade falling in May, by 1.2 per cent. It has slid in four out of five months in 2015 and risen just 1.5 per cent in the past 12 months — less than the growth in global output and far below the long-term average of about 7 per cent a year.

The problem has been getting worse for some time. Trade bounced back fairly well in 2010 after the global recession but it has disappointed ever since, growing by barely 3 per cent in 2012 and 2013. Now it seems the world cannot manage even that.