The artificial-intelligence race is becoming so expensive that it's snuffing out one of the key forces that has helped keep Big Tech stocks soaring for years: steady share buybacks.
For years, stock buybacks were one of the most reliable levers of the major technology to sustain their quotes. Mechanics is simple, because by reducing the number of securities in circulation, companies raise the profit per share and, with it, the price of value. Investors know it and discount it. Now, however, that lever is disappearing, devoured by the cost of the race for artificial intelligence.Of the four major investors in AI, only Micros…