Carol had none of the superiority she felt toward Mrs. Lyman Cass’s plutocratic parlor.
There are no more uses of "plutocracy" in the book.
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…Had it been some plutocrat’s mansion, but a housing project, gentlemen of the jury, a housing project!
Ayn Rand -- The Fountainhead
Nearly every one else in Packingtown did the same, however, for there was universal exultation over this triumph of popular government, this crushing defeat of an arrogant plutocrat by the power of the common people.