US stock market today: Why the Dow is up but S&P 500 and Nasdaq are sinking as Alphabet jumps and Nvidia tumbles on Meta–Google chip talks

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US stock market traded mixed Tuesday. The Dow rose 0.6% to 46,707.85. The S&P 500 stayed flat. The Nasdaq slipped 0.3%. Nvidia fell over 4% after reports that Meta may buy Googles AI chips. Alphabet …