"When a man spends his own money to buy something for himself, he is very careful about how much he spends and how he spends it.

When a man spends his own money to buy something for someone else, he is still very careful about how much he spends, but somewhat less what he spends it on.

When a man spends someone else's money to buy something for himself, he is very careful about what he buys, but doesn't care at all how much he spends.

And when a man spends someone else's money on someone else, he doesn't care how much he spends or what he spends it on. And that's government for you."

— Milton Friedman