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S&P 500's Shiller P/E nears dot-com highs, signaling possible overvaluation but long-term investing still advised.

Market News
13 May 2026
Seeking Alpha
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Neutral
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The S&P 500's Shiller P/E ratio is approaching levels seen during the dot-com bubble, currently around 40x compared to the peak of 44x in that era. This high valuation suggests potential overvaluation and elevated growth expectations, though the predictive power of the Shiller P/E is debated. Despite these concerns, improvements in the S&P 500's return on invested capital (ROIC) and earnings growth provide some justification for higher multiples. For long-term investors with a 10-20 year horizon, staying invested in the S&P 500 is recommended over attempting market timing, as historic mean reversion risks remain but do not outweigh the benefits of sustained investment.

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