Ten-year Treasury yields moved above 5% on 15 September, just ahead of the Fed hike, and have stayed there, reaching 5.3% on 5 October. That is the highest level in almost 25 years. Yet equity markets have remained resilient, with the S&P 500 and the Nasdaq setting new highs. So, the key question is not just where yields go next, but what is driving them and how they will impact markets.
The cycle is still being supported by investment, but supply shocks are also biting. Energy remains the key near-term constraint, while AI is the bigger structural story. Energy determines how much tightening is needed. AI determines how much the economy can absorb. The Fed sits between the two.
The Fed reaffirmed its commitment to price stability at the latest FOMC meeting, but calibration is now the harder task.
Tightening too much could discourage the productive investment that may eventually help ease inflation. Tightening too little could allow inflation pressures to build again after a long period of missed targets. That uncertainty is itself a risk premium, and it helps explain why bond volatility remains high.
Higher rates are also a capital-allocation story. AI, digital infrastructure, power generation, the energy transition, defence, strategic autonomy and public deficits all require substantial funding. Public and private borrowers are competing more directly, pushing yields higher across the market. Heavy issuance is also changing the marginal Treasury buyer, with the market relying more on private investors, asset managers and hedge funds. These are more price-sensitive buyers, which adds to rate pressure. The investment boom is therefore creating both the growth that supports markets and the cost of capital that tests them.
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