In some cases, compound interest may swell small amounts into a fortune, as happens in the Hitchhiker's Guide to the Galaxy by Douglas Adams and When the Sleeper Wakes by H. G. Wells, or the Futurama episode "A Fishful of Dollars".
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In the Demon Princes pentalogy by Jack Vance the currency 'SVU' or Standard Value Unit was described as being employed on most major settled worlds and having a value equivalent to one hour of common labor.
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