S&P 500 Breaks 90-Year Earnings Trendline as AI-Driven Profits Diverge From CPI Data

{"The divergence appeared in September data. Ned Davis Research documented the index breach, while producer prices rose 0.4 percent monthly and goods prices jumped 1.1 percent, led by a 24 percent diesel spike. Small-cap and equal-weight indices fell more than twice as far as the cap-weighted S&P, confirming narrowing leadership concentrated in AI names.","This pattern repeats prior cycle peaks. In 2000 and 1929, earnings detached from trend on technological enthusiasm before reverting. Current PPI acceleration to 5.4 percent and 10-year yields pressing 5 percent mirror the rate-sensitive compression that followed those breaks, independent of stated Fed policy.","The oil-driven inflation component limits monetary response. Headline CPI at 3.4 percent and core at 2.4 percent give no clean signal for further hikes, yet sustained crude above recent levels would compress multiples in rate-sensitive sectors first. Historical analogs show such leadership failures precede broader index declines within six months.","Next data points are the FOMC decision and October CPI. If the 10-year yield holds above 4.8 percent and small-cap relative performance fails to recover, the earnings trend breach becomes a contraction signal rather than a secular shift."}