One key reason not to leave the eurozone is that it will destroy your domestic banking system. But if depositors start to think your country may leave the eurozone then they'll start withdrawing money from your banks en masse and your domestic banking system will be destroyed anyway. So if your domestic banks are doomed, it's actually better to get ahead of the curve so you can leave and start imposing capital controls ASAP.
This, incidentally, is why any "firewall" strategy is going to be hard to implement. If you're Portugese and Greece leaves the euro, isn't your next move going to be to close out your local bank account to either hold cash euros or shift the funds into a German bank?
TODAY IN SLATE
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As a NASA guinea pig, I verified that women would be cheaper to launch than men.