Global stocks have fluctuated wildly over the past week, as concerns about AI valuations hang over equity markets. Some respite from a four-day sell-off followed Nvidia 's earnings release on Wednesday, but its own gains were quickly reversed during Thursday's trading session as New York-listed stocks lost further ground . Friday saw U.S. stocks rebound into positive territory , while Asian chip shares took a battering , and a sell-off in Europe was reignited . 'Everything bubble' The possibility that equity markets are in an AI bubble has been a hot topic for months, with investors scrambling to work out if companies can deliver on the trillion-dollar AI hype . But Dan Hanbury, who co-manages the Global Strategic Equity strategy at investment manager Ninety One, told CNBC that while the f

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