(10.11.2011) If the euro zone survives the crisis—and the meltdown of Italy‘s bonds in the markets suggests that is becoming ever more difficult—it will plainly require deep reform of the EU‘s treaties. Done properly, by keeping the euro open to countries that want to join (like Poland) and deepening the single market for those that do not (like Britain), the creation of a more flexible EU of variable geometry could ease many of the existing tensions. Further enlargement need no longer be so neuralgic; further integration need no longer be imposed on those who do not want it.