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After a huge rise in the past two months, NVIDIA shares closed Thursday with a market capitalization of 1.72 trillion U.S. dollars, second only to Amazon's 1.76 trillion U.S. dollars, and is expected to overtake the latter to become the fourth largest publicly traded company in the United States. So far this year, NVIDIA shares have soared more than 40%, reflecting strong demand for artificial intelligence chips. But such a rapid rise has also increased investor concern about the sustainability of the stock price. Permanent Portfolio Family of Funds President Michael Cuggino said, ...