HomeInvesting Mantra's - StockWhen the facts change - John Maynard Keynes. Investing Mantra's Investing Mantra's - Stock When the facts change - John Maynard Keynes. Investment Guru Thursday, May 11, 2017 0 Investing Mantra's Investing Mantra's - Stock When the facts change, I change my mind. What do you do Sir? - Mr. John Maynard Keynes. Tags Investing Mantra's Investing Mantra's - Stock Newer Older