J.P. Morgan Asset Management's latest Guide to the Markets 1 (U.S., 4Q 2026, as of September 30, 2026) arrives at a moment of genuine tension: earnings are surging, valuations are stretched, rates are high, and the global growth narrative has quietly shifted away from American exceptionalism. Dr. David Kelly, CFA, and his colleagues at J.P. Morgan Asset Management have assembled a 68-page data compendium that, read carefully, tells a story more nuanced than the S&P 500's headline level suggests.
Is the equity rally built on solid ground -- or stretched optimism?
The S&P 500 sits at 7,652, trading at a forward P/E of 19.0x against a 30-year average of 17.2x. The cyclically adjusted price-to-earnings ratio stands at 40.9x, nearly double its long-run average of 28.9x. Kelly et al. note directly that "U.S. large cap equities appear expensive relative to history on almost all metrics." That is not a minor caveat. It is the central tension of the report.
What justifies current prices is earnings. Profit margins have reached a record 15.9%, and EPS growth for 2026 is forecast at 31.6% -- an extraordinary figure driven heavily by technology and AI-adjacent sectors. The Magnificent 7 now account for 35% of S&P 500 market cap, though their earnings premium over the S&P 493 has narrowed considerably from its 2023 peak. The convergence is meaningful: as Kelly et al. observe, "the valuation premium of the Mag 7 vs. the S&P 493 has narrowed significantly." The implication is that index returns may broaden, but that broadening comes from the rest of the market growing into higher valuations rather than the leaders pulling back.
Underpinning this is a structural bet on artificial intelligence. AI-related industries now represent 53.2% of the S&P 500 by market cap, and hyperscaler capital expenditure is projected to rise from $416 billion in 2025 to $1.2 trillion by 2028. Whether that investment generates commensurate returns remains the defining unanswered question of the cycle.
What does the economy actually look like beneath the surface?
GDP expanded at 2.2% in Q2 2026 -- respectable, not exuberant. Headline CPI sits at 3.4%, still above the Fed's 2% target, and the federal funds rate remains around 4.1%. The 10-year Treasury yield has climbed to 5.29%, real yields are running at 3.12%, and the yield curve has re-steepened to an upward slope after years of inversion. This matters: the re-steepening reflects both persistent inflation expectations and fiscal concerns that are no longer theoretical.
The federal deficit reached $1.853 trillion in fiscal 2026. Federal debt stands at 99.4% of GDP. Kelly et al. describe the fiscal path plainly: interest payments on the debt have now surpassed defence spending. The tariff picture has clarified somewhat -- the effective tariff rate has fallen from a peak of roughly 30% in April 2025 to 10.6% -- but trade policy uncertainty lingers in corporate planning assumptions.
Perhaps most telling is the consumer. The University of Michigan Consumer Sentiment Index has fallen to 48.1, near a historic trough. Yet aggregate spending data remains resilient. Kelly et al. characterize the divergence clearly: "wealth inequality has widened, with upper-income households buoyed by asset appreciation while lower-income households face persistent cost-of-living pressure." This K-shaped dynamic explains both the sentiment trough and the continued spending -- they describe different populations.
Has the case for non-U.S. equities finally arrived?
It has, at least for 2026. Non-U.S. developed market equities have returned 14.7% in U.S. dollar terms year-to-date; emerging markets have delivered 23.7%. A weaker U.S. dollar -- down roughly 8% on a trade-weighted basis -- has amplified local returns for American investors holding international positions. International equities trade at a 32% discount to U.S. equities on forward earnings. Kelly et al. note that "non-U.S. equities offer attractive valuations relative to the U.S., with dividend yields and earnings yields both meaningfully higher." For advisors who spent years defending a home-country-overweight, 2026 has provided the counter-argument in real time.
Where does fixed income fit in a 5.29% world?
The U.S. Aggregate Bond Index yields 5.56%. Real yields at 3.12% exceed their long-run average by a substantial margin. Kelly et al. are direct: at these yield levels, bonds provide genuine income again, and their role in portfolio construction has been restored. The report highlights that the 60/40 portfolio's equity allocation has drifted to roughly 74% for investors who have not rebalanced -- a meaningful shift that increases volatility exposure precisely when valuations are elevated.
5 Key Takeaways for Advisors and Investors
- Valuations demand humility. The S&P 500's forward P/E of 19.0x and CAPE of 40.9x are not disqualifying, but they do compress forward return expectations. Advisors should set realistic benchmarks with clients.
- AI capex is the cycle's defining bet. With $1.2 trillion in projected hyperscaler investment by 2028, the market is pricing an enormous return on that capital. Concentration risk in AI-adjacent names is real and rising.
- International diversification is no longer theoretical. Non-U.S. equities have outperformed in 2026. The valuation discount is material. Currency tailwinds may persist. The case for geographic diversification has empirical support right now.
- Rebalancing is overdue for most portfolios. A 60/40 portfolio that has not been rebalanced likely sits near 74/26. At current equity valuations and with bonds yielding over 5.5%, the risk-reward argument for rebalancing is clear.
- Time in market remains the most durable principle. Kelly et al. note that there has been no negative 20-year rolling return for U.S. equities in the data series. Periods of low consumer sentiment -- like the present -- have historically preceded strong subsequent returns. Staying invested, diversified, and rebalanced is not a passive strategy. It is an active one.
Footnote:
1 Kelly, David, et al. Guide to the Markets: U.S., 4Q 2026. J.P. Morgan Asset Management, 30 Sept. 2026, cdn.jpmorganfunds.com/content/dam/jpm-am-aem/global/en/insights/market-insights/guide-to-the-markets/mi-guide-to-the-markets-us.pdf.
