The core euro problem is the dramatic differences in economic performance of the 17 member countries. Germany’s a star, the PIIGS aren’t. By sharing the euro devaluation is not possible. Moreover, the Germans won’t tolerate inflation, and labor mobility is low. The ideal solution; have richer countries perpetually support the poorer countries. It’s what we do here, via transfer payments from rich states (CT) to poor states (WV) via Washington.