Theres a point there. The two main problems with the eurozone one-size-fits-all interest rate at its launch were that for Germany it was way too high because of their tiny growth rate, and for Portugal it was way too low to address their runaway inflation. Now the Germans are somewhat less than happy about bailing out the rest of them, and Portugal is about to go the same way as Greece and Ireland. When/if that particular sh*tstorm hits Spain then its game over imho, I cant see the euro surviving that.