Shiller CAPE Ratio

L2: Indicators · Signal 32 of 27

What This Signal Tells You

Imagine a car dashboard warning light that only flickers on when the engine has been running hot for a full decade, ignoring the brief cool-downs of a single season. When this specific gauge climbs higher, it signals that the price of stocks has stretched far beyond what the underlying companies have actually earned over that long period, creating a fragile state where even small shocks can cause a sharp correction. As the reading begins to fall, it often means the market is finally paying a more reasonable price for future growth, though the timing of that drop can be unpredictable. For investors, this metric serves as a long-term compass that warns when the odds of strong future returns are low and the risk of significant losses is elevated.

TIER 3 VALUATION INDICATOR

The Shiller CAPE Ratio

Cyclically Adjusted Price-to-Earnings: Smoothing Volatility to Reveal True Market Extremes

Current Reading (February 2026)

31.8

VERY HIGH — TOP 5% HISTORICALLY

Exceeds 1929 Black Tuesday (30). Only 2000 (44) and 2021 (38.6) higher in recorded history. Implies 10-year average real returns of 2-4% annually.

The Nobel Prize Insight: Robert Shiller’s CAPE

Robert Shiller, Yale economist and 2013 Nobel Prize winner, developed the Cyclically Adjusted Price-to-Earnings (CAPE) ratio as an answer to a fundamental problem in valuation: earnings volatility obscures true market conditions.

The inspiration came from Shiller’s deep historical research into market manias, crashes, and irrational behavior. He observed that traditional P/E ratios—stock price divided by trailing twelve-month earnings—could be misleading during periods of cyclical earnings compression or expansion. An economy in recession appears “cheap” on traditional P/E metrics, but that’s often the worst time to buy. Conversely, cyclical peaks make the market appear “expensive,” but from a long-term perspective, cyclical earnings are temporarily depressed.

Shiller’s solution: divide the stock price by the 10-year average real (inflation-adjusted) earnings. This 10-year rolling smoothing removes the noise of individual business cycles, recession, and temporary booms. The resulting ratio reveals whether the market is truly expensive or cheap on a structural basis.

The metric first gained widespread attention after the 2000 tech crash. The CAPE had spiked to 44x in 1999-2000, its highest level ever recorded (exceeding even 1929). Within two years, the NASDAQ fell 75%. The CAPE’s warning had been accurate—though the timing was off by months to years. When the 2008 financial crisis hit, the CAPE had moderated to 27x, suggesting valuations had corrected meaningfully from the tech bubble peak.

Shiller’s work proved instrumental in establishing that extreme valuations are predictive of poor future returns. His research showed a 10-year forward correlation of -0.80 between CAPE ratio and subsequent real returns. High CAPE predicts low returns; low CAPE predicts high returns.

How CAPE Works: Smoothing the Cycle

The Calculation and Logic

The CAPE calculation is mechanically simple:

CAPE = Current Price / (10-Year Average Inflation-Adjusted Earnings)

For the S&P 500, this uses real (CPI-adjusted) earnings from the past 120 months. The earnings are smoothed to eliminate the distortions of individual years.

Why 10 years? A typical U.S. business cycle lasts 7-10 years. From expansion peak to trough and back represents roughly one cycle. By averaging over 10 years, Shiller captures earnings through a full cycle, revealing the structural earning power of corporations, not their temporary cyclical position.

Interpreting CAPE Levels

Since Shiller’s data goes back to 1871, we have nearly 155 years of context:

• 15x or below: Historically cheap. Appears at major market bottoms (1982, 2009, 2020 briefly). Future 10-year returns typically 8-12% annually.

• 15-20x: Fair value. “Normal” range for long-term equity investing. Future returns around 5-7%.

• 20-25x: Moderately elevated. Typical of late-stage bull markets. Future returns 3-5%.

• 25-35x: Very expensive. Rare territory. Only appears during serious bubbles. Future returns 0-3%.

• 35x+: Extreme bubble. Historically only 1929 (peaked at 30, similar to today) and 2000 (44x). Future returns often negative in real terms.

What CAPE Doesn’t Do

Critical caveat: CAPE does not predict when crashes occur. The 2000 peak at 44x did not lead to an immediate crash—the decline took two years. The 2021 reading of 38.6x presaged a modest correction in 2022, but not a catastrophic crash. This is the major limitation that often frustrates investors who treat CAPE as a timing tool rather than a severity indicator.

CAPE predicts magnitude and average returns, not timing. When CAPE is 31.8x, future returns will be poor—but that poor performance could unfold over 5 years, 10 years, or get temporarily interrupted by further euphoria.

The Earnings Adjustment Factor

One nuance deserves highlighting: corporate profit margins have expanded significantly since 1980. Technology, scale, and globalization have allowed companies to increase operating margins. A CAPE of 31.8x in 2026 is not directly comparable to a CAPE of 31.8x in 1926 in terms of fundamental quality.

However, this argument has limits. Margins compress during recessions. If the economy slows or competitive pressures increase, margins revert to historical means. Assuming permanent elevation in margins is a classic bubble-era rationalization: “this time is different.”

31.8x in February 2026: Above the 1929 Peak

At 31.8x, the market trades above even the 1929 Black Tuesday peak (30x). The only two periods in 155 years with higher valuations are 2000 (44x) and 2021 (38.6x). Both preceded significant corrections. The current level places us in the top 2-3% of all valuations in recorded history, suggesting future 10-year real returns of 1-3% annually—barely above inflation.

The 5-Phase Framework: Where CAPE Places Us

Phase 0: Post-Crisis Expansion (CAPE: <15x)

Valuations at historical lows

Crisis aftermath. Fear pervasive. CAPE averaging 12-14x. Investors who buy here lock in exceptional 10-year forward returns (8-12%). Last seen in 2009 (13x), 2020 (25x briefly during COVID crash).

Phase 1: Melt-Up and Recovery (CAPE: 15-20x)

Fair value to slightly elevated

Economic recovery visible. Earnings growth justifies valuation increases. CAPE of 18-20x is healthy, sustainable. Typical early bull market phase. Lasts 3-5 years. Forward returns still decent (5-7%). Market feels good but not euphoric.

Phase 1 Extended: Late Melt-Up (CAPE: 20-25x)

Clearly elevated but not yet extreme

Bull market becoming mature. Narrative shifts from “undervalued recovery” to “strong growth.” Sentiment increasingly positive. CAPE at 23-25x signals valuations stretched but not yet in bubble territory. Forward returns declining to 3-5%. Can persist if earnings growth accelerates.

Phase 2: Crack Formation (CAPE: 25-35x)

Very expensive

Bubble inflation underway. 2000 peaked at 44x in this zone (extreme upper end). 2021 reached 38.6x. At 31.8x, we are clearly here. Market cap vastly exceeds fundamental values. Momentum-driven. “This time is different” narrative dominant. Forward 10-year returns only 1-3%.

Phase 3: Forced Liquidation (CAPE: 20-25x)

Rapid repricing downward

Crash phase. CAPE typically falls 30-50% in 1-2 years. 2000-2002 CAPE fell from 44x to 20x. 2007-2008 fell from 27x to 12x. Market cap crashes faster than earnings decline. Leverage unwound. Panic selling.

Phase 4: Reset and Accumulation (<15x)

Deep value conditions

Capitulation complete. Fear extreme. Contrarian investors accumulate. CAPE at 12-14x locks in 8-12% forward returns. Last true Phase 4 was 2009 (13x). Brief COVID dip in 2020 touched 25x but did not reach Phase 4.

The Current Implication: Phase 2 Is Now

At 31.8x, the Shiller CAPE places us squarely in Phase 2: Crack Formation. This is not a phase of safety or gradual reversion. This is a phase where structure is breaking, where the next 2-4 years will likely see significant repricing.

The CAPE does not tell us when the crash comes. But it tells us:

• Forward 10-year returns will be poor (1-3%). Patient capital deployed today should expect single-digit real returns.

• Risk is asymmetric to the downside. CAPE could fall to 20x (35% decline) or to 15x (50% decline).

• Current prices reflect perfection. Any disappointment in earnings, economic growth, or interest rates will trigger repricing.

CAPE and the Interest Rate Puzzle

Does Lower Rates Justify Higher CAPE?

One persistent defense of high CAPE readings: interest rates justify higher valuations. When the 10-year Treasury yield is 2%, a 3.5% earnings yield (inverse of 28.5x P/E) looks attractive relative to the risk-free rate. Conversely, at 4.5% Treasury yields (current level), stocks yielding 3% (33x CAPE inverse) look less attractive.

This argument has merit but important limits:

• Shiller already controls for rates via historical context. The CAPE was 31-32x in 2021 when rates were near zero. Rates have risen 400+ basis points since then. If higher rates justified lower valuations, CAPE should have fallen significantly more than it has.

• Rate normalization cuts both ways. Higher rates raise discount rates, compressing valuations. But higher rates also eventually slow economic growth and earnings. The “earnings yield advantage” disappears if earnings fall.

• Historical precedent matters. In 1929, bonds yielded 4-5%, similar to today. The market still crashed 90%. In 1966, rates were 4.75%, the market fell 48%. High rates do not prevent crashes; they often coincide with them.

The honest conclusion: higher rates make the 31.8x CAPE harder to justify, not easier. Historical precedent suggests valuations should contract.

Lessons from the Previous Extremes

2000: The Tech Bubble Peak (CAPE: 44x)

The CAPE reached its all-time high of 44x in December 1999, driven by euphoria about the “new economy,” Y2K fears resolved, and the belief that tech companies would disrupt traditional economics. The narrative was “this time is different.” The NASDAQ was up 150% in two years. Rationality seemed quaint.

Over the following two years, the NASDAQ fell 75%. The CAPE fell to 20x. Investors who had bought at 44x saw their capital cut in half, and it took until 2006-2007 for CAPE to return to 27x (still below the 2000 peak, suggesting earnings growth had been weak).

Key lesson: A CAPE of 44x did not prevent further appreciation for 6-12 months, but it did predict multi-year devastation. Timing was impossible; severity was predictable.

2021: The Reflation Bubble (CAPE: 38.6x)

In January 2021, after a decade of near-zero rates and massive pandemic stimulus, the Shiller CAPE reached 38.6x—the second-highest level ever. Fed funds were at zero; the narrative was “rates will stay low forever”; euphoria was high.

What followed: a brutal 2022 with the S&P 500 down 18%, then a recovery in 2023-2024, then another swoon. By February 2026, CAPE had fallen to 31.8x—a 17% reduction from the peak. Investors who bought at 38.6x have experienced low single-digit returns through most of the interim period. Forward returns for the next 10 years remain poor.

Key lesson: Valuations matter enormously for long-term wealth. CAPE of 38x predicts poor 10-year returns even if short-term volatility permits further gains.

The Fundamental Truth CAPE Reveals

The Shiller CAPE at 31.8x is screaming the same message it has screamed only twice before: valuations are extreme, future returns will be poor, and capital is better deployed defensively. This is not a “sell everything” signal—crashes come unexpectedly. But it is a “stop aggressively buying” signal and a “focus on income and quality” signal.

What Should You Do at 31.8x CAPE?

For long-term accumulators: Dollar-cost average at much slower pace. Deploy capital gradually, knowing that 10-year returns will be modest. Prioritize dividend-paying stocks and bonds yielding 4.5% (now competitive with stocks).

For traders: High CAPE is unstable. It can stay elevated for quarters or years, but it will eventually revert violently. Hedging strategies, long-dated put options, and short positioning become attractive.

For retirees: At 31.8x CAPE, equity volatility is high while forward returns are low—a terrible combination. Raise allocation to bonds and fixed income. Reduce stock exposure from 60/40 toward 40/60 or even 30/70.

For new investors: The worst time to start aggressive stock accumulation is when CAPE is at historic extremes. Begin with smaller positions and increase gradually over coming years as valuations normalize.

BuildersLens Research | February 2026 This analysis is for informational purposes and does not constitute investment advice. The Shiller CAPE is a severity indicator, not a timing tool. Past performance does not guarantee future results. Consult a qualified financial advisor for personal investment decisions.

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