the worst case scenario is a depression greater the "The Great Depression" I think Bernake did a PHD on the Great Depression. In essence the the IMF is bailing out the EU and since the US is the biggest contributor to the the IMF, the US is bailing out the EU after having bailed themselves out. But as far as Greece goes, the money will never be paid back as they will riot some more before accepting the austerity measures...and austerity measures decreases growth even more making payments less likely in the long term. But, remember:Ben Bernake has a PHD on the Great Depression, so Greece may not be too big to fail but certainly, Europe is too big to fail!