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Tech sell-off drives US markets down by nearly $1tn after subpar earnings reports

Big tech stocks falter as investors question whether billions being poured into AI can generate returns quickly enough A sell-off of tech stocks that began earlier this month and gained steam with disappointing earnings from leading tech companies drove US markets down by hundreds of billions of dollars Friday. In total, the decline has knocked nearly $1tn in value off the tech-heavy Nasdaq exchange in one week and erased about $2tn in a month. The S&P 500, the index of the 500 most valuable com