The September consumer price index came in at 3.7 percent year over year, a notch above the consensus, and the market's reaction was immediate: odds of a Federal Reserve hike in October climbed into the upper range of a coin flip, and the dollar jumped to a fresh multi-month high.
The print mattered less for its level than for its message. Core inflation ran hotter than expected, energy prices near one hundred and six dollars a barrel for Brent kept feeding the headline, and the market's prior consensus — that the Fed's first hike in years would be a one-off reset — had been quietly unwound in recent sessions. The 10-year yield rose, short-end yields followed, and the sell-off concentrated where growth and duration risk sit: technology, small caps, and AI infrastructure equities.
The bond market's move deserves attention on its own. Traders who hold the Fed's funding costs on their desks do not raise hike odds casually; the shift in expectations followed a session in which the equity market had already priced a pause. The result is a self-reinforcing loop — a stronger dollar and higher yields raise the financing cost of the AI capex cycle, which is the very expenditure the equities are re-rating around.
The path forward is narrow. A soft inflation surprise in the coming months could unwind the hike narrative quickly, but the damage would be done: markets have been burned on this trade before in this cycle, and each time a Fed miss is followed by an equity drawdown. For long-duration tech, the lesson is that the discount rate is no longer a background variable — it is the story.
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