John Maynard Keynes? Paul Samuelson? Winston Churchill? Joan Robinson? Apocryphal? Question for Quote Investigator: John Maynard Keynes was an enormously influential economist, but some of his detractors complained that the opinions he expressed tended to change over the years. Once during a high-profile government hearing a critic accused him of being inconsistent, and Keynes reportedly … Continue reading Quote Origin: When the Facts Change, I Change My Mind. What Do You Do, Sir?