Adeimantus: But if a single state amasses the wealth of all the others, will not that be a danger to a state that has none?
Socrates: I congratulate you on your idea that any state other than the one we are constructing deserves the name.
Adeimantus: Why, what should the others be called?
Socrates: By some grander name, for each of them is not one state, but many: two at least, which are at war with another, one of the rich, the other of the poor, and each of these is divided into many more.

Plato, The Republic ยป