A Wall Street Firm Modeled Out an AI Crash: S&P 500 Down 30%, $20 Trillion Gone. But Here's What Happens Next

A Wall Street firm has published a scenario analysis modeling a hypothetical AI-driven market crash in which the S&P 500 falls roughly 30% and about $20 trillion in equity value is erased, according to the headline. The transmission mechanism in such a scenario typically runs through a repricing of long-duration growth expectations, as elevated valuations of AI-linked mega-cap earnings are discounted against slower productivity gains and higher capital expenditure risk, with spillovers into credit spreads and risk appetite. The S&P 500 is the most directly exposed benchmark, given the index's heavy concentration in a small group of technology and AI-beneficiary names, which would amplify index-level drawdowns relative to a broader sector shock. Because the report is a modeled outcome rather than an observed event, its near-term market impact depends on whether it shifts positioning or hedging demand in index options, where implied volatility on the S&P 500 would be the key gauge to watch. Traders should monitor the next CPI release and upcoming hyperscaler capital expenditure guidance, since either could confirm or challenge the earnings assumptions underpinning the model.

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