A messy, disorderly and globally extremely serious economically disruptive disintegration of the euro zone and the collapse of its currency, a scenario some commentators call eurogeddon, is no longer just the talk of alarmists. At least two European governments have started working on contingency plans for such an eventuality, which would leave very few if any economies in the world untouched by the fallout. The euro was created on the premise that no extreme country-specific imbalance would ever pose a threat to the stability of the common currency area. An intergovernmental covenant on the Stability and Growth Pact was considered, on its own, to be sufficient. But recent crises in euro bond markets have highlighted the structural problem...