[Fasten your seat belt! Legendary investor: the AI foam will burst, and the US stock market is expected to fall with it!] Jeremy Grantham, a legendary investor who successfully predicted three market foam, sounded an alarm bell about the expanding real estate foam, and warned that the US stock market is seriously overvalued, and the next 10 years may be disappointing, while the seemingly booming US economy is actually out of touch with reality. He predicts that the wave of artificial intelligence (AI) will cool down and drag down the stock market. The market historian also criticized the Federal Reserve for repeatedly blowing up the asset foam, and regarded climate change, resource reduction and population reduction as serious long-term threats.