AI is fueling the stock market, sending the value of tech companies like Nvidia and Microsoft into the stratosphere. This week, Microsoft's market valuation surged past $4 trillion. That's nearly the GDP of India. Roben Farzad, host of the podcast "Full Disclosure," explains Microsoft's role in the competition. And, Nvidia — which makes microchips for AI — recently hit the same valuation milestone of $4 trillion. Chris Miller, author of the book "Chip War: The Fight for the World's Most Critical Technology," explains why Nvidia is gaining so much traction so fast and what it says about the value of chips.

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