There is no single ratio that can settle whether the S&P 500 is expensive. Compare several measures—forward price-to-earnings (P/E), CAPE, dividend yield and an earnings-yield spread—with their own dated historical baselines. These measures describe what investors pay relative to different fundamentals; none can tell you when stocks will fall.
Start with a dated comparison, not a universal cutoff
A valuation number is meaningful only when you know its date, calculation and comparison series. For each measure, note the observation date and provider, then compare it with a historical average or median calculated on a compatible basis. A 30-year average is not interchangeable with a historical median, and figures from different providers may use different definitions.
The latest multi-metric snapshot in the cited materials is dated March 31, 2026. J.P. Morgan Asset Management figures reproduced in Mississippi PERS investment committee materials in April 2026 show all four measures pointing toward higher-than-average valuations, but each captures a different relationship:
| Measure | March 31, 2026 reading | 30-year average | What the comparison indicates |
|---|---|---|---|
| Forward P/E | 19.7x | 17.2x | The index price was higher relative to forecast earnings than the stated average. |
| Shiller P/E / CAPE | 37.2x | 28.7x | The index price was higher relative to its long-run, inflation-adjusted earnings measure than the stated average. |
| Dividend yield | 1.6% | 2.0% | Expected dividends represented a smaller share of price than the stated average. |
| Forward earnings yield less Baa corporate bond yield | -0.3% | 0.7% | The forward earnings yield was below the selected corporate-bond yield, unlike the positive stated average spread. |
These are dated figures from J.P. Morgan Asset Management, reproduced in Mississippi PERS investment committee materials, April 2026—not live readings. The Federal Reserve’s November 2025 Financial Stability Report separately said the S&P 500 forward P/E was well above its historical median. Neither source establishes the index’s valuation on October 7, 2026, so do not present these numbers as current on that date.
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What each valuation metric can—and cannot—tell you
Forward P/E: price versus expected near-term earnings
Forward P/E divides an index’s price by expected earnings. The Federal Reserve’s aggregate measure uses expected earnings for the next 12 months. It answers a near-term question: how much price investors are paying for the earnings analysts currently expect? Because those earnings are forecasts, estimates can be revised or prove wrong. A lower or higher ratio can therefore reflect changing price, changing expectations, or both.
CAPE: price versus a smoothed earnings history
The cyclically adjusted P/E ratio, commonly called CAPE or the Shiller P/E, compares price with a ten-year average of inflation-adjusted earnings. Smoothing earnings across a longer period reduces reliance on one unusually strong or weak year. But the measure can respond slowly to changes in the economy and index composition, and historical earnings may not be fully comparable with current businesses’ payout practices. The Federal Reserve Bank of Minneapolis discusses both the long earnings window and the importance of share repurchases when interpreting CAPE.
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Dividend yield: expected cash distributions relative to price
Dividend yield compares expected dividends with the current price. A lower yield means expected dividends make up a smaller portion of the price paid, all else equal. It is not a complete measure of shareholder payouts: companies can also return cash through buybacks, and dividends can change.
Earnings-yield spread: a rough interest-rate reference
Earnings yield is the inverse of P/E: earnings divided by price. Comparing it with a bond yield adds interest-rate context, but the result depends on which bond yield is selected. The March 2026 institutional table uses a Baa corporate bond yield; the Federal Reserve’s November 2025 report discusses earnings yield relative to a real Treasury yield. These are different comparisons and should not be treated as the same series.
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The Federal Reserve describes the earnings-yield-minus-real-Treasury-yield comparison as a crude measure of the extra return investors require for holding stocks rather than risk-free bonds. It is only a rough frame: corporate earnings are not a guaranteed coupon, and the spread is not a complete model of equity risk or expected return.
Free cash flow: an additional lens, not a replacement standard
A free-cash-flow comparison can ask whether cash remaining after investment changes the valuation picture. Its result depends on the chosen cash-flow definition and data coverage, so it is best treated as an additional lens rather than an uncontested substitute for earnings-based measures. The Minneapolis Fed discusses this alternative alongside the role of repurchases in interpreting CAPE.
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How to read agreement and disagreement across measures
If several indicators look expensive against their own historical references, that is a stronger valuation signal than relying on one ratio alone—but it is not proof of a coming decline. The March 2026 figures illustrate both agreement and nuance: forward P/E and CAPE were above their stated 30-year averages, while dividend yield was below its average and the earnings-yield/Baa spread was below its average. Those differences matter because the measures use different denominators and answer different questions.
- Check whether the measures are built from forecasts, reported earnings, dividends or cash flow.
- Keep the historical baseline attached to its own metric and provider; do not compare unlike periods or definitions as if they were equivalent.
- Investigate why a measure diverges from the others. Forecast revisions, index composition and payout choices can affect the readings differently.
- Use bond yields as context for relative valuation, not as a direct promised-return comparison.
Valuation describes price; it does not time the market
A high valuation says that investors are paying a high price relative to a selected measure of fundamentals, compared with a particular reference. It does not establish when prices will fall, whether they will fall at all, or what next year’s return will be. Forecast uncertainty, changing earnings composition and different payout methods all complicate the interpretation. Use valuation as one input to a long-term assessment, not as a short-term trading signal.
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Sources
- Federal Reserve Board, Financial Stability Report, November 2025—forward P/E and the earnings-yield/real-yield comparison.
- J.P. Morgan Asset Management, Guide to the Markets figures reproduced in Mississippi PERS investment committee materials, April 2026—dated readings and 30-year averages as of March 31, 2026.
- Federal Reserve Bank of Minneapolis, 2026—discussion of CAPE, free cash flow and share repurchases.
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