The name of this old pagan’s god was Compound Interest.
Foot passengers, jostling one another’s umbrellas in a general infection of ill temper, and losing their foot-hold at street-corners, where tens of thousands of other foot passengers have been slipping and sliding since the day broke (if this day ever broke), adding new deposits to the crust upon crust of mud, sticking at those points tenaciously to the pavement, and accumulating at compound interest.
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.