The rate debate that decides nothing

On September 10th the Dow, the S&P 500 and the Nasdaq ended lower as Treasury yields jumped and American crude climbed past $100 a barrel. The worry underneath the noise is the yield on the ten-year Treasury, now hugging 5% — a level that last coincided with broad stock weakness in October 2023.

Investors are being handed a story in which that level is a political outcome. At one end of the tug-of-war stands Kevin Warsh, the hawkish new Federal Reserve chairman, who took office in May and used his 100th day at Jackson Hole to warn that interest rates "could need to move higher". At the other stands Scott Bessent, the Treasury secretary, who is buying long-dated bonds — more than doubling his buybacks to $4bn a session — because he thinks yields do not reflect underlying fundamentals. The market's fate, the story implies, hangs on who prevails.

Not so, says Aswath Damodaran, the NYU finance professor known as the Dean of Valuation. In a recent essay he calls the argument over what the Fed can or cannot do "pointless", and concludes there is little that Mr Warsh or Mr Bessent can do to change the course of rates. The claim sounds like defeatism, or an academic washing his hands of the week's drama. It is better read as a statement about where power actually sits.

The 4-5% box

Mr Damodaran's reasoning is that the long-term risk-free rate is not set by whoever happens to occupy two chairs in Washington. It is pinned by two fundamentals: the inflation that people on average expect over the long run, and the real growth of the economy. Expected inflation has settled near 2.5% even though actual inflation has been far jumpier. Add real growth and you get an "intrinsic" risk-free rate that behaves as gravity for the market rate — and the ten-year has indeed been pulled into a fairly tight box, between 4% and 5%, since 2022. By his reckoning the intrinsic ten-year rate stood at 5.41%, against an actual 4.75%, the gap having nearly closed.

The test of the thesis has been harsh, and it has passed. This is the detail that matters: a change of Fed chairman, an activist Treasury and a sequence of FOMC meetings have together done little to move Treasury rates, which have drifted steadily higher regardless. The two men are anyway pulling the same lever in opposite directions — Mr Warsh, who wants to shrink the Fed's bond portfolio, would push long yields up; Mr Bessent's buybacks push them down. Their quarrel over the 1951 Treasury-Fed Accord is real. But it is a dispute over the trim of a ship whose course is set by the current.

None of this means central bankers are irrelevant. Mr Warsh's rhetoric has shifted the odds of near-term rate hikes, and Mr Bessent's purchases do flatten the curve at the margin. To be sure, power at the short end, over the fed funds rate, is real and consequential. It is the long end — the rate that actually prices a company's future cash flows, and the one everyone is panicking about at 5% — that neither man commands. The market's excuses for moving long yields, to Mr Bessent's frustration, have kept arriving from inflation, deficits and private investment demand.

Earnings, not the Fed, set the trend

The practical consequence for a shareholder is that the Washington news cycle is largely noise. What moved American stocks in 2026 was not the fed funds rate but earnings. The S&P 500 is up more than 11% this year even as yields rose, because analyst estimates for 2026 and 2027 profits were revised up by more than 11% over the first eight months estimates raised by more than 11%. Mr Warsh himself cites S&P 500 profits growing more than 20% and capital expenditure rising at an annual clip near 9%.

The daily haggling is the tell. On days when the ten-year yield rises by more than three basis points, the S&P 500 has dropped by roughly half a percent; on days it falls by that much, the index has gained about the same a drop of roughly half a percent. That is the whole of the rate anxiety: a quantifiable wobble around a trend set elsewhere. Trading it is chasing your own tail; the signal worth reading is the earnings pathway.

The real variable that would change the picture is not the chairman's next sentence. It is a break in the anchored belief that long-run inflation stays near 2.5%. Break it to the upside — with inflation expectations unmoored — and the discount rates applied to long-duration growth stocks rise a break in inflation expectations, hitting the most richly valued parts of the market hardest. Break it to the downside and the 4-5% box gives way, re-rating precisely those stocks. Until one of those happens, the honest expectation is more of the same: a market that climbs on earnings and flinches on yield spikes.

That makes selection, not timing, the investor's lever. With rates pinned and pricing power scarce, sectors diverge sharply: energy and top-heavy technology have led, while consumer, utility and communications shares have lagged. The S&P's forward price-to-earnings ratio of about 20 remains above its long-run norm, so a break in expectations would not be cushioned by cheapness.

The deepest irony is that the two most powerful-looking figures in American rate-setting are competing for control of a dial that neither of them turns. The ten-year sits where it does because of what bond buyers believe about inflation and growth — beliefs no chairman can decree and no buyback can purchase. Watch that belief. It is the only thing that can actually move the market you own.