So the Greeks are going to vote on the austerity package (and lets assume Greek turkeys don't vote for Christmas), then what?
We can't let them completely default within the euro as it would bring down most of the banks this side of the pond making RBS's shortcomings look like a kid who didnt have enough pocket money for a penny mix and the Beano.
We can't kick them out because that ammounts to the same thing as their currency (and therfore debt) would be worthless.
So what happens?

