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AP Photo
FILE - In this April 16, 2015, file photo, an employee monitors prices at the tech-driven Nasdaq MarketSite in New York. From Silicon Valley to Shanghai, surging share prices for technology companies means the industry is making up an ever-larger chunk of stock funds. Tech companies have been able to produce strong profit growth for years, even when the global economy was scuffling, but the strong performance also raises worries that they’re overpriced. (AP Photo/Mark Lennihan, File)