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  • AI: what kind of bubble is it?

    AI: what kind of bubble is it?

    28 September 2026

    Across six bubble metrics, the current period has most in common with the GFC era: liquidity has become abundant and investor borrowing has built up, meaning that a sharp downturn would trigger margin calls, amplifying the fall On investor over-optimism, dot-com is a closer parallel, pointing to the risk of sharp equity falls if the bubble bursts Some reassurance comes from improving US corporate health: both average default probability and the share of firms with a default probability above 10%

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