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U.S. stock markets faced significant declines, with the Nasdaq Composite dropping 2.3% amid investor concerns over tech stocks and AI investment costs. Intel's shares plummeted 28% due to disappointing financial forecasts, while Amazon's stock fell 1% after underperforming quarterly results. The semiconductor sector also suffered, with AMD, Broadcom, and Nvidia experiencing losses. Defensive sectors like consumer staples and healthcare saw gains, helping to mitigate losses in the Dow Jones. Investors are increasingly cautious about AI infrastructure companies' debt levels and profitability prospects.