Nov 11 — Mounting unease over artificial intelligence trading is putting investors’ long-relied-upon buy-the-dip strategy to the test. The S&P 500 fell again on Tuesday, snapping a two-day rebound; the index had tumbled 4.4% last Thursday, its biggest one-day drop since the 2025 global trade war peak. Although futures point to a possibly higher open on Wednesday, the buy-the-dip impulse after this pullback is markedly weaker than in the past. Bloomberg data show that this century the S&P 500 has seen 33 single-day declines of similar magnitude, and barring a few exceptions in 2009 and 2020, each was followed by at least one trading day with a gain of 3.4% or more within the ensuing week. Investors’ reluctance to step in reflects heightened market anxiety over AI trading in the wake of the U.S. midterm elections. Tuesday’s hotter-than-expected inflation data, together with Nvidia-related controversies, added further pressure. Adam Phillips, managing director of portfolio strategy at EP Wealth Advisors, said the firm will not yet use the recent weakness in tech stocks to add exposure and will keep a close eye on Nvidia’s earnings report next week, though recent developments have undoubtedly come at an awkward time.