Stock market crash fears are rising proper now as a result of the S&P 500 Shiller CAPE ratio has climbed again above 40x, its highest degree because the dot-com bubble, when it peaked close to 44x. That stretched S&P 500 valuation, together with the Nasdaq’s slide right into a inventory market correction, has became a transparent inventory market crash warning for lots of buyers, and historical past reveals simply how painful a reversal can get.
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Why The S&P 500 Valuation Looks Like 2000
The Shiller CAPE ratio works like a price-to-earnings a number of for the S&P 500, averaging inflation-adjusted earnings over 10 years. When the dot-com bubble burst, it hit an all-time excessive of roughly 44x. At the time of writing, it’s again above 40x, as pleasure round synthetic intelligence pushed the S&P 500 valuation greater.
More shares have hit 52-week lows than highs in latest buying and selling, even on up days. That final occurred simply earlier than the dot-com bubble burst, and the inventory market crash that adopted minimize the S&P 500 by almost 40% and the Nasdaq by almost 80% over roughly three years. It’s a giant a part of at present’s inventory market crash warning.
Officials have raised the alarm on costs earlier than. Jerome Powell, who was Federal Reserve Chair on the time, had this to say in September 2025:
By many measures, for instance, fairness costs are pretty extremely valued.
A couple of weeks later, the Bank of England acknowledged:
The threat of a pointy market correction has elevated.
Nasdaq Correction Adds To The Stock Market Crash Warning
The Nasdaq Composite has been hit the toughest, and it’s down 10.6% from its peak. The S&P 500 has misplaced 7.1% and the Dow 8.4%.
The index first closed in correction territory on March 26, sliding from a file 23,958 to 21,408 on tariff worries and better oil costs. The U.S.-Iran battle has since despatched oil to a multiyear excessive. Moody’s chief economist Mark Zandi believes a sustained battle within the Middle East might tip the U.S. financial system into recession, which might flip the slide right into a deeper inventory market crash.
IMF Managing Director Kristalina Georgieva additionally acknowledged in October 2025:
If a pointy correction had been to happen, tighter monetary situations might drag down world progress.
History presents some hope. Since 2011, the Nasdaq has fallen no less than 10% from a file a dozen instances, and it returned a mean of twenty-two% over the next 12 months, rising in 11 of these 12 circumstances, per YCharts knowledge. Still, previous outcomes assure nothing, and a inventory market correction can run longer than anticipated.
How Investors Can Prepare For A Stock Market Crash
Brewer doesn’t suppose panic promoting is the suitable reply to a attainable inventory market crash. He suggests checking your threat tolerance, letting money pile up, shifting towards sectors corresponding to client staples and utilities, and trimming the largest winners and riskiest AI bets.
Long-term holders have additionally survived sharp drops. The Invesco QQQ Trust, which follows the Nasdaq-100, returned 912%, or 16.6% a yr, during the last 15 years, even with 12 Nasdaq corrections alongside the best way.
Right now, the S&P 500 valuation and the value of oil are the 2 numbers to regulate. Expensive markets can hold climbing for months. But if the 2000 script repeats, the present inventory market correction might nonetheless flip right into a full inventory market crash earlier than the AI rally finds its toes once more.
