The inability to float of each Eurozone nation's currency puts incredible strains on the countries with weaker economies. There is no scope for devaluation or revaluation, either gradual or sudden. Two years ago I was getting a euro for a quid for my holidays. This year I got €1.40. I could have got that regardless of which Eurozone country I visited. That covered Germany, almost as strong an economy as you could wish to have, and Greece, a bloody basket case. That just doesn't work.