Bank of America: the AI narrative is the last line of defense for markets

Last week, Meta's AI assistant Muse made a high-profile debut, helping push the Nasdaq up more than 3%. In a report covered by Wallstreetcn on October 4, 2026, Bank of America warned that the AI narrative has become the last line of defense for the U.S. Treasury market and is acting as a buffer against macro risks. If that narrative cracks, the bank said, suppressed macro risks could emerge at once and hit stocks with a real shock.

Bank of America's equity derivatives team wrote that in a market with limited attention, macro risks have trouble competing with the AI growth story for focus. FOMO around AI has encouraged investors to buy every dip, creating what the report calls an 'AI put' effect that has helped keep equity volatility in check. The team describes a setup in which investors treat AI-related optimism as a kind of insurance against macro headlines, so dips are bought rather than sold. The VIX remains relatively mild, a sharp contrast with the violent swings in the bond market.

The report's central tail risk is a failure in the AI narrative: a repricing of growth prospects would turn bond-market problems into a broader market crisis. Once the AI put stops working, all other risks could be 'materially amplified,' the team said. At the same time, the U.S. bond market is under its most concentrated selling pressure since February of last year, with yields reaching multi-decade highs. As of the report, the warning remains at the research level, while the AI narrative continues to cushion macro risk.