Summary

• The S&P 500 has become highly concentrated in Big Tech, with the top ten stocks now over 40% of its weighting.
• AI-driven earnings and unusual income sources have inflated valuations, but forward returns may be at risk due to elevated expectations and narrow profit growth.
• Accelerated AI CapEx and declining free cash flow in tech giants signal a changing risk profile for S&P 500 investors.
• Diversification into value-focused ETFs and select single stocks is recommended to mitigate concentration and sector-specific risks.
• This idea was discussed in more depth with members of my private investing community, Main Street Alpha. Learn More »
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Introduction

One of the debates on the stock market that has existed since the stock market became mainstream (I think) is whether the stock market is the economy. I think this debate has lasted for so long because both sides have good points.

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