The Big Short fame and other investors have warned that stocks could tumble a lot more before the current downturn is over. These market veterans have warned that rising interest rates and inflation could cause the US economy to go into a recession. US stocks are set to double or triple their recent declines, Jeremy Grantham warned in a CNBC interview this month. The market historian suggested that the S&P 500 could plunge by more than 50% from its current level to about 1,900. The prices of housing, bonds, energy, metals, and food have gone up. This has turned out to be very dangerous because we are messing with all of the assets. The investor warned that the Federal Reserve might not shoring up asset prices given the risk of worsening inflation. The current market downturn is similar to the collapse of the mid-2000s housing bubble, according to Michael Burry. It hurts, it is not fun, and I am not smiling, as I said about 2008, the investor wrote on May 24. The S&P 500 index could lose half its value and sink below 1,900 if the market continues to slump, warned the chief of the Scion Asset Management. It could be several years until Amazon, Microsoft, and other high-flying stocks record their bottom tick, as they did in 2002 and 2009, according to him. The greatest speculative bubble of all time in all things was diagnosed by Burry last summer and he warned buyers of meme stocks and cryptocurrencies that the "mother of all crashes" was coming. The shift in markets from easy money and soaring asset prices to rising interest rates, raging inflation, and both geopolitical and economic headwinds was underscored recently by Ray Dalio. Like all bubbles or paradigm shifts, the mentality that did exist was that we don't have to worry about inflation, cash is a safe place, and so on. There has been a 14-year bull market, and there is a punch in the face to all investors. The S&P 500 could tumble another 21% to around 3,300 points, according to a recent MarketWatch article. The S&P 500's dividend yield has historically correlated with the 10-year Treasury yield before a bear market ends. He was unsurprised by the sell-off, and compared the recent downturn to the summer of 2008, raising the prospect of a recession. He said that the past two years were a fake bull market built on sand. Keep reading.Here's a roundup of their comments on the recent market slump: