One of the wisest statesmen of the 20th century was Margaret Thatcher.
One of her pearls of wisdom is this: "The problem with socialism is that eventually you run out of other people’s money."
That is precisely what is happening in Greece.
Mark Steyn explains the problem, and why it is a problem for the United States, here.
OPM, or other people's money, is the Euro of socialism/liberalism/communism/fascism.
It is plentiful but not inexhaustible.