Recent policy and academic debates have begun to influence Eurozone reform. But how sound is the advice we give out? This column argues that calls for a Eurozone or full-fledged EU superstate are overstated. Yes, developing an adequate system of European banking supervision is a matter of urgency if we hope to tackle the threat posed by an overdeveloped and opaque financial system. But calling for a superstate misunderstands the reasons politicians introduced the euro in the first place.