Two reasons: Debts and austerity measures. As mentioned before, it depends on how well Greece would fare after a default & Grexit. I personally believe they would do fine after a short bit of pain, especially because Russia and/or China will take the opportunity to make such a strategically important friend in Europe.

I definitely don't buy the doom about a famine, those have even become rare in Africa. The international community won't let Greeks die of hunger en masse.


Have you seen the unemployment ratings in those countries, especially among the younger generations? Have you seen Podemos in the polls? There is a very big chance of a domino effect.