I’m of sound mind—can reckon compound interest in my head, and remember every fool’s name as well as I could twenty years ago.
Poor Mr. Casaubon had imagined that his long studious bachelorhood had stored up for him a compound interest of enjoyment, and that large drafts on his affections would not fail to be honored; for we all of us, grave or light, get our thoughts entangled in metaphors, and act fatally on the strength of them.
There are no more uses of "compound interest" in the book.
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The power of compound interest over long periods of time is not intuitive.
At the end of ten years they had paid everything, everything, with the rates of usury and the accumulations of the compound interest.