The S&P 500 is heading for a third consecutive annual gain in the double digits as the bull market momentum continues -- and the index even closed at record levels in recent days. What's driven this seemingly unstoppable energy? Over the past couple of years, investors have rushed into artificial intelligence (AI) stocks -- in many cases, these players weigh heavily in the index, so they can significantly impact the index's direction. I'm talking about names such as Nvidia and Alphabet , for example, AI stocks that have climbed more than 30% and 60%, respectively, this year.

Investors are betting on AI players because the technology may be a potential game changer, like the internet or, traveling much farther back in time, the telephone or the printing press. In the case of AI, anal

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