A technology-led market sell-off stretched into a second day on Tuesday as investors questioned whether artificial intelligence spending can generate profits fast enough to justify high valuations. The Nasdaq Composite fell 2.2% to 25,587, the S&P 500 lost about 1.4%, and the Dow Jones Industrial Average slipped less than 0.1%; Bloomberg said concerns about AI valuations erased nearly $1.3 trillion from Nasdaq 100 market capitalization over two days. The selling followed a sharp drop in South...

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