Who really said it
A Banker Lends You His Umbrella When It's Sunny and Wants It Back When It Rains
Quote Investigator ↗ concludes that “the first instances of this maxim are anonymous” and that Mark Twain, Robert Frost and Ambrose Bierce were all “implausibly attached to the quotation” years later. The kernel of the idea turns up in a London accountancy weekly in April 1905, and the full-fledged wording in The Journal of Business of the University of Chicago in January 1930 — credited there to nobody but “some person of shrewd wit.” The line appears nowhere in The Devil’s Dictionary, and the earliest credit to Bierce that QI located is a 1999 economics paper.
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