Citi analyst Willem Buiter paints a doomsday scenario.
"A Greek Exit From the Euro Area:
a Disaster For Greece,
a Crisis For the World"
As soon as Greece has exited, we expect the markets will focus on the country or countries most likely to exit next from the euro area. Any non-captive/financially sophisticated owner of a deposit account in that country (or in those countries) will withdraw his deposits from banks in countries deemed at risk - even a small risk - of exit. Any non-captive depositor who fears a non-zero risk of the future introduction of a New Escudo, a New Punt, a New Peseta or a New Lira (to name but the most obvious candidates) would withdraw his deposits from the countries involved at the drop of a hat and deposit them in the handful of countries likely to remain in the euro area no matter what - Germany, Luxembourg, the Netherlands, Austria and Finland...Apart from bank runs in every country deemed, by markets and investors, to be even remotely at risk of exit from the euro area, there would be de facto funding strikes by external investors and lenders for borrowers from these countries....
The funding strike and deposit run out of the periphery euro area member states (defined very broadly), would create financial havoc and mostly like cause a financial crisis followed by a deep recession in the euro area broad periphery. The counterparty inflow of deposits and diversion of funding to the ‘hard core’ euro area and the removal (or at least substantial reduction) of the risk of ECB monetisation of EA sovereign and bank debt would drive up the euro exchange rate. So the remaining euro area members would suffer (at least temporarily) from an uncompetitive exchange rate as well from the spillovers of the financial and economic crises in the broad periphery....
A banking crisis in the euro area and in the EU would most likely result from an exit by Greece from the euro area. The fundamental financial and real economy linkages from the rest of the world to the euro area and the rest of the EU are strong enough to make this a global concern.
Complete paper here.