Markets are climbing, optimism is high, and artificial intelligence is powering a historic surge led by companies like Nvidia and Alphabet. But veteran investor Jeremy Grantham is urging caution, warning that the US market is now in what he calls the 'biggest stock market bubble ever.'
Grantham believes the current rally—fueled by AI enthusiasm—has pushed valuations beyond previous extremes, even surpassing the dot-com peak. He cautions that the eventual correction could be severe, potentially echoing the scale of the Great Depression.
