Two renowned investors offer advice to investors rattled by the market's wide swings. : Stock market volatility is back with a vengeance, putting investors on a roller coaster ride since hitting a record high on January 26. Rattled stockholders can do no better than look to seasoned billionaire investors Ray Dalio and Warren Buffett for advice. Both insist that panicked selling is the wrong response to a market decline. Speaking at Harvard University's Institute of Politics in February, Dalio told attendees, as quoted by CNBC: "You cannot possibly succeed that way. You've got to do the opposite.