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Dorothy Neufeld
2025-02-14 09:05:00
www.visualcapitalist.com
The Bubble Indicator: Is the Stock Market Overheating?
Today, the S&P 500’s cyclically adjusted price-to-earnings ratio (CAPE) is nearing historic highs, signaling market valuations may be in overheated territory.
In December 2024, the S&P 500 CAPE ratio stood at 37.9—well above its long-term average of 17.6. Notably, it has only exceeded this level during the Dot-Com bubble and in 2021.
This graphic from Picton Mahoney Asset Management shows the S&P 500 CAPE ratio since 1920.
The S&P 500 CAPE Ratio Across Major Bubbles
The CAPE ratio is a widely used metric for assessing stock market valuations, comparing equity prices to their 10-year average earnings.
By smoothing out short-term fluctuations, it accounts for economic cycles and offers a more stable view of long-term value. Higher CAPE levels often signal stretched valuations, with historical trends showing that ratios above 22 typically indicate heightened market optimism.
Here are the peak CAPE ratios during major market bubbles over the past century:
| Name | Peak S&P 500 CAPE Ratio |
Peak Date | S&P 500 Returns the Year After |
|---|---|---|---|
| Post-Pandemic | 38.6 | Nov 2021 | -19.4% |
| Housing/Commodity Bubble | 27.6 | May 2007 | -38.5% |
| Dot-Com Bubble | 44.2 | Dec 1999 | -10.1% |
| Nifty Fifty Bubble | 22.3 | Dec 1968 | -11.4% |
| The Great Crash | 32.6 | Sep 1929 | -28.5% |
Sources: Data as at December 2024. Robert Shiller data from January 1920 to December 2024. TradingView and Picton Mahoney Asset Management Research.
The CAPE ratio hit an all-time high during the Dot-Com bubble in 1999, which was followed by a 40% decline in the S&P 500 from 2000 to 2002.
More recently, the ratio climbed to 38.6 in 2021, its second-highest reading ever, fueled by massive pandemic stimulus and a big tech rally. The following year, the S&P 500 sank 19.4% as the Federal Reserve kicked off its monetary tightening cycle.
Similarly, the CAPE ratio has risen sharply as AI enthusiasm—particularly for Magnificent Seven stocks—has led stock prices to soar, making stock prices expensive by historical standards.
Diversification Strategies for Market Bubbles
At a time of outsized investor expectations, a more balanced portfolio allocation may reduce exposure to market bubble risk.
Investors and advisors can implement Picton Mahoney Asset Management’s Innovative Portfolio, which offers a strategic 40/30/30 mix of equities, bonds, and alternatives to hedge against a potential asset bubble.
Download The 2025 Picton Report.
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The post The Bubble Indicator: Is the Stock Market Overheating? appeared first on Visual Capitalist.
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