There are two different sorts of economy in the Eurozone, which I can characterise (because I'm the one writing this) as Northern and Southern. They have separate financial policies, because they're separate countries, but they are governed by a single set of interest rates and exchange rates, because there's only the one currency. The only solutions to this inherent contradiction seem to be either to bust the whole thing up and go back to pesetas, drachmae, lire and escudos, or to muddle through somehow: which is the option currently being leant towards. Both ways will lead to catastrophe.
So, how about the middle road? Instead of fissiparating the Euro into seventeen old currencies, how about two? We can call them the Seuro and the Neuro, if you like. They get exchanged at a rate of 1:1 on the cutover date, then they go their own separate ways. I haven't worked out the details yet, it's only nine-thirty, but I can't see any insuperable problems. The Americans will be a hiccup, but heck, it's all their fault anyway; and the Irish'll just have to decide whether to jump into the Atlantic or the Med.