“Mr. Smith” shows up in 1300 A.D. to invest ten gold coins at 10% annual interest with Sior Marin Goldini’s firm, after which he shows up every 100 years to provide guidance.
In one hundred years, at ten per cent compounded annually, your gold would be worth better than 700,000 zecchini.

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  1. “Compounded Interest” by Mack Reynolds, Magazine of Fantasy and Science Fiction, August 1956.
    2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . written by Mack Reynolds