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S&P 500 Shiller P/E Ratio Hits 42, Signaling Potential Mid-Term Bear Market

The S&P 500's Shiller P/E ratio exceeding 40 for over a month signals a potential mid-term correction, as historical data suggests such premium valuations are unsustainable.

📅 September 6, 2026 🕐 1 min read

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🎯 Key Takeaways

The Shiller P/E ratio, which averages inflation-adjusted earnings over a decade, currently sits at 42.04.
Extended periods above a 40 multiple have historically preceded major market declines, such as the 2000 dot-com crash.
Despite short-term risks, long-term data shows that rolling 20-year periods for the S&P 500 have consistently yielded positive returns.

📝 Executive Summary

The S&P 500's Shiller P/E ratio has surpassed 40 for an extended period, a rare valuation milestone observed only twice in 156 years. Historically, such extreme valuations have preceded significant market downturns, including the dot-com bubble burst and the 2022 bear market.

❓ FAQ

What is the Shiller P/E ratio?

The Shiller P/E, or CAPE ratio, measures the S&P 500's price against its average inflation-adjusted earnings over the trailing 10 years, smoothing out cyclical volatility.

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