History Says a Stock Market Sell-Off Is Coming Eventually. Here's the Smartest ETF to Buy Right Now.

The article flags a Shiller CAPE ratio near 41, well above its historical average of 17.8, as a warning that U.S. stocks may be overvalued; the S&P 500, Nasdaq and Dow are up 78%, 99% and 53%, respectively, over three years. It also notes that four in 10 S&P 500 stocks have declined this year despite a 17% index gain over the past year, with recent gains concentrated in AI stocks. The article recommends staying invested for the long term, citing J.P. Morgan research that 7 of the market’s 10 best days occurred within two weeks of its 10 worst days and that investors who missed the best days earned less than half the total returns of those who stayed invested.

Analysis

CAPE is a weak timing signal but a useful return-risk signal: an elevated starting multiple raises the odds of muted 6–18 month index returns, not necessarily an imminent drawdown. The more actionable near-term issue is narrow leadership. In a capitalization-weighted index, weakening breadth can coexist with index strength until a small set of large constituents disappoints; that creates downside convexity if earnings revisions or rate expectations turn against them. It also means VOO is less diversified by economic driver than its sector count implies.

The contrarian case is that CAPE can stay elevated when earnings quality, margins, and the index’s sector mix differ from historical averages. A high reading alone does not establish overvaluation on near-term earnings or identify a catalyst. The cited best-day clustering also argues against an all-or-nothing exit: it supports keeping strategic exposure, not ignoring concentration or foregoing hedges. Over the next 1–3 months, monitor market breadth, earnings-revision breadth, and real yields; over 6–18 months, valuation is a headwind if earnings fail to grow into prices. No trade follows from CAPE alone.

Key Decisions for Investors

• Keep core broad-equity exposure aligned with mandate rather than liquidating on CAPE. Rebalance oversized positions to policy weights; VOO retains concentration risk despite its sector breadth.
• Consider a relative-value watch, not an automatic entry: favor S&P 500 equal-weight exposure over capitalization-weighted exposure only if breadth and earnings revisions improve. If breadth deteriorates while the index holds up, treat that divergence as a de-risking signal.
• Do not initiate a directional short solely on the valuation metric. If portfolio drawdown limits warrant protection, price a defined-risk index put spread; verify implied volatility, skew, and hedge cost first, since those inputs are absent.
• Falsify the cautious view if breadth broadens and earnings revisions accelerate without a material rise in real yields. Escalate risk reduction if breadth contracts further, large-cap earnings guidance weakens, or real yields rise enough to pressure long-duration valuations.