CITI economists Willem Buiter and Ebrahim Rahbari write:
First, we raise our estimate of the likelihood of Greek exit from the eurozone (or ‘Grexit’) to 50% over the next 18 months from earlier estimates of ours which put it at 25-30%. Second, we argue that the implications of Grexit for the rest of the EA and the world would be negative, but moderate, as exit fear contagion would likely be contained by policy action, notably from the ECB.
http://www.economist.com/blogs/freee.../euro-crisis-2