She was regarded as an heiress; for not only had the sisters seven hundred a-year each from their parents, but if Dorothea married and had a son, that son would inherit Mr. Brooke’s estate, presumably worth about three thousand a-year—a rental which seemed wealth to provincial families, still discussing Mr. Peel’s late conduct on the Catholic question, innocent of future gold-fields, and of that gorgeous plutocracy which has so nobly exalted the necessities of genteel life.
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.