Jeremy Grantham Calls U.S. Market Priciest in American History
Legendary investor Jeremy Grantham warns AI-driven valuations have pushed U.S. stocks to their most expensive levels ever recorded.
Legendary investor Jeremy Grantham issued a stark warning this week, declaring the U.S. stock market the most expensive in American history — a distinction he attributes directly to soaring valuations fueled by artificial intelligence enthusiasm. The veteran market historian, known for accurately calling previous bubbles, says the AI frenzy has stretched prices to levels that dwarf prior peaks.
Grantham's alarm centers on the premium investors are willing to pay for stocks tied to or boosted by AI narratives. The resulting valuations, he argues, have pushed broad market metrics beyond anything seen in recorded U.S. financial history — a benchmark that includes the dot-com bubble of 2000 and the pre-crash highs of 1929.
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The warning carries weight given Grantham's track record. The GMO co-founder built his reputation by identifying and calling out speculative excess before major downturns, and his current assessment suggests he believes the market faces serious mean-reversion risk. Analysts note that when a figure with his credibility invokes historical comparisons this extreme, institutional investors tend to pay attention.
Whether this signals an imminent correction or simply a prolonged period of elevated risk remains an open debate on Wall Street. Bulls argue that AI represents a genuine productivity revolution capable of justifying higher multiples, while skeptics like Grantham contend that no technological shift has ever permanently suspended the laws of valuation gravity.
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