there is oligarchy when the rich govern without consideration for the poor, democracy when power is in the hands of the needy and they disregard the interest of the rich.
 Bertrand Russell, A History of Western Philosophy (1945). copy citation

Context

“retains some oligarchic elements (12936) . But between monarchy and tyranny the only difference is ethical. He is emphatic in distinguishing oligarchy and democracy by the economic status of the governing party: there is oligarchy when the rich govern without consideration for the poor, democracy when power is in the hands of the needy and they disregard the interest of the rich. Monarchy is better than aristocracy, aristocracy is better than polity. But the corruption of the best is worst; therefore tyranny is worse than oligarchy, and oligarchy than democracy. In this way Aristotle arrives at a qualified defence of democracy;” source