The bull market is turning 4 years old — but yields could crash the party

The S&P 500 has risen 118.4% since its Oct. 12, 2022 bear-market closing low of 3,577, reaching 7,811 as the bull market enters its fourth year. Technology and AI have driven the advance, but the article says stocks must justify their valuations against roughly 5% returns on safer assets, posing a potential headwind.

Analysis

The key risk is not simply that safe assets offer an attractive yield; it is that a further rise in real yields or term premium raises the discount rate just as equity valuations depend heavily on distant AI-related cash flows. That creates asymmetric pressure on long-duration growth stocks, while companies with nearer-term cash generation should be relatively resilient. A high yield level alone is not a sell signal: stable yields can be absorbed if earnings broaden and AI spending produces measurable returns. The more damaging combination is rising yields alongside weaker earnings breadth or evidence that AI capital spending is outpacing monetization.

Near term, watch the direction and volatility of yields, real rates, and equity breadth rather than the anniversary of the bull market. Over 1–3 months, inflation and rate repricing are the main macro catalysts; a growth scare is a separate downside path because falling yields would not necessarily help equities if earnings estimates also fall. Over 6–18 months, the test is whether AI productivity and revenue gains justify continued investment and valuation premiums. The contrarian point: a quoted safe-asset return is not directly comparable with equity returns, which carry growth optionality; the article supplies no inflation, valuation, or earnings data to establish that stocks are broadly overpriced. No unconditional index short is warranted on this evidence.

Key Decisions for Investors

• Avoid adding broad market beta solely on momentum. Treat a sustained rise in real yields accompanied by deteriorating market breadth as a signal to reduce high-duration exposure, not as proof that the entire bull market has ended.
• For a relative-value expression, consider a small, defined-risk short in QQQ against a long in RSP, sized to limit broad-market exposure. The thesis is growth-duration underperformance if yields rise and leadership narrows; exit if breadth improves while real yields stabilize or fall. Verify current valuations, earnings revisions, and borrow/options costs before implementation.
• Keep short-duration Treasury exposure as a carry and liquidity buffer rather than making a large long-duration Treasury bet. A recession-driven yield decline could coincide with falling equity earnings, limiting the hedge value of long Treasuries.
• Monitor real yields, inflation data, earnings-revision breadth, and evidence of AI return on investment. Reassess the defensive tilt if yields decline without earnings deterioration and gains broaden beyond mega-cap technology; strengthen it if yields rise while guidance and breadth weaken.