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The release of a less capital-intensive artificial intelligence model from China’s DeepSeek sent a chill through the U.S. stock market Monday, initiating a massive selloff led by Nvidia and hitting billionaires where it hurts—their…

The release of a less capital-intensive artificial intelligence model from China’s DeepSeek sent a chill through the U.S. stock market Monday, initiating a massive selloff led by Nvidia and hitting billionaires where it hurts—their…