millionocracy

plural millionocracies

1. archaicA ruling class consisting of millionaires, or the very rich.

   We have already seen that if the candidate belong to the aristocracy or to the millionocracy his election is a matter of course, since he will pay his fees and give no further trouble; […]

   1845, Wade's London Review, volumes 1-3, page 360

   1 more example

   His confreres in the millionocracy laughed at such a slight and delicate distinction, and they were not wrong; but he, though he was not in the right, kept repeating his pet phrase, "I am a commercial man, and I do not want to get rich by robbery."

   1886, Nikolay Gavrilovich Chernyshevsky, A Vital Question: Or, What is to be Done?, page 399