The Nasdaq and S&P 500 slid on Tuesday driven by tech stocks, as investors gear up for what Federal Reserve chair Jerome Powell will say about the path of interest rates at a key conference later in the week. The Nasdaq fell as megacaps lost, after having rallied for much of the year. Nvidia fell 3.5%, the biggest drop in nearly four months. The key event this week is the Fed’s annual symposium at Jackson Hole, Wyoming, from Aug. 21-23, where Powell’s comments will be scrutiniz

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