The Stock Market Is on the Verge of Doing Something Not Witnessed in 155 Years -- and the Implications for Wall Street Are Frightening

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Sean Williams, The Motley Fool

Sat, June 6, 2026 astatine 8:26 AM CDT 6 min read

Despite the Iran war-driven swoon successful March, it's shaping up to beryllium different stellar twelvemonth for Wall Street and investors. On June 2, the celebrated Dow Jones Industrial Average (DJINDICES: ^DJI), broad-based S&P 500 (SNPINDEX: ^GSPC), and innovation-driven Nasdaq Composite (NASDAQINDEX: ^IXIC) each galloped to grounds closes.

These gains person been fueled by respective factors, including:

Will AI make the world's archetypal trillionaire? Our squad conscionable released a study connected the 1 little-known company, called an "Indispensable Monopoly" providing the captious exertion Nvidia and Intel some need. Continue »

The improvement and proliferation of artificial quality (AI)
A historically debased firm income taxation rate, which powered grounds S&P 500 stock buybacks successful 2025.
Better-than-expected firm earnings

A New York Stock Exchange level trader looking up successful bewilderment astatine a machine monitor.

But this parabolic determination higher for Wall Street whitethorn beryllium much precarious than this trio of starring indexes suggests. The banal marketplace is connected the verge of making dubious past -- the benignant that hasn't been witnessed implicit the past 155 years -- and the implications for Wall Street and investors are downright frightening.

The banal marketplace is wrong eyeshot of its priciest valuation successful past

On the heels of the AI revolution, the banal marketplace is nearing its priciest valuation successful history.

To preface this discussion, "value" is simply a subjective word that varies from 1 capitalist to the next. Without a one-size-fits-all blueprint to measure nationalist companies, 1 person's trash tin genuinely beryllium another's treasure connected Wall Street.

With the supra said, determination is 1 valuation instrumentality that consistently cuts done the affectional and subjective aspects of investing: the S&P 500's Shiller Price-to-Earnings (P/E) Ratio. You'll sometimes spot the Shiller P/E referred to arsenic the Cyclically Adjusted P/E Ratio, oregon CAPE Ratio.

Unlike the accepted P/E ratio, which is based connected trailing 12-month net per stock (EPS), the Shiller P/E accounts for mean inflation-adjusted EPS implicit 10 years. A much encompassing presumption ensures that the Shiller P/E maintains its usefulness successful immoderate economical climate.

Although economists introduced the CAPE Ratio successful the precocious 1980s, it's been back-tested to January 1871, providing 155 years of price-to-EPS data. Whereas the CAPE Ratio has averaged astir 17.38 since January 1871, the S&P 500's Shiller P/E closed retired the June 2 trading league astatine 42.84.

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