Stocks tumbled on Monday, extending a dayslong slide that presents a dilemma: Should investors buy in at bargain prices or unload in fear of worse to come? The tech-heavy Nasdaq plummeted 3% last week, the index’s largest weekly decline since the aftermath of President Donald Trump’s “ Liberation Day ” tariffs in April. The S &P 500 fell 1.6% over that period, ending three consecutive weeks of gains. The trading marks a rare bout of turbulence on this year’s glide path to higher returns. Even after the losses, the S &P 500 remains up 15% in 2025. While the Dow Jones Industrial Average has climbed 11%, and the Nasdaq has soared 19%. Two major culprits are to blame for the downturn, analysts said: Growing skepticism about the artificial-intelligence technology at the heart of the market rall

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