Single-market Blues

摘要

In france railway crossings are adorned with a small lesson for a life of gnomic brevity. "One train can conceal another," is the message printed on warning signs. It is a motto that supporters of free trade should remember as they scan the horizon for threats to the European Union's greatest achievement: the borderless single market. Those watching out for protectionism have plenty to alarm them, right before their eyes. But the biggest threats to the single market are those hidden from view.