The Magnificent Seven technology stocks have powered the S&P 500 through this bull market so far -- that's because investors like their solid, well-established businesses and their promise in the high-potential artificial intelligence (AI) market. Some are bigger AI players than others, but they all are participating to some degree in this technology. Investors are enthusiastic about AI because it may supercharge earnings and stock performance over time.

And, as mentioned, the stock performance already has started, with the Magnificent Seven stocks each advancing in the double- or triple-digits over the past three years. This is great, but it's resulted in one thing that may be holding investors back from buying at least certain players right now: Stocks have become more expensive.

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