It would not be a stretch to describe this period of hyperactive growth in the tech industry as a historic moment. Nvidia, which makes computer chips that are essential to building artificial intelligence, said on Wednesday that its quarterly profit had jumped to nearly $32 billion, up 65 percent from a year earlier and 245 percent from the year before that. Just three weeks ago, Nvidia became the first publicly traded company to be worth $5 trillion. Microsoft, Google, Apple and Amazon are also now valued in the trillions. In their most recent quarters, the four companies reported more than $110 billion in combined profits.