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From the archive · Thursday, September 24, 2026

Treasury yields hit two-decade highs on the day diesel fell hardest — and the government's own auctions had been pricing more hikes for a fortnight.

Interest rates jumped, and oil looks like the smaller part of it.

Growth-led repricing of the hiking path

The US Treasury market had its sharpest session in months on 2026-09-23. The five-year yield rose 16 basis points to 5.00%, the ten-year 15 to 5.12% and the thirty-year 10 to 5.40%; Valor puts the ten-year at its highest since 2004 . The S&P 500 fell 0.75%, the dollar index rose to an eight-week high, and gold lost 1.33%. Brent's November contract recovered to $103.08 (+3.86%) after an attack on a vessel in the Strait of Hormuz killed an Indian sailor.

The easy reading is that oil did it. The evidence says otherwise. New York Harbor diesel — the refined product that reaches freight, food and the consumer price index — fell 3.35% on the same session, after the Energy Secretary rejected an outright export ban and the White House denied planning one . Gold, which protects against inflation, fell. The dollar rose. And the five-year led the thirty-year, flattening the curve: the 5s30s spread narrowed to 40 basis points from 46. Had this been an energy-inflation scare, the inflation-sensitive assets would have been bid and the long end would have led. Neither happened. What the bond market was pricing is a longer hiking path, and Bloomberg names its drivers: US business activity at its fastest pace in more than five years and a weak debt auction.

The auction record is where this was visible first. The Treasury's 2-year note cleared at 4.787% on 22 September, against 4.204% in August and 4.315% in July — 58 basis points higher in a month in which the Fed moved 25. The 6-month bill cleared 4.155% on 21 September, above the 4.00% top of the new policy range. The 20-year cleared 5.42% on 15 September against 5.204% in August, and the 10-year inflation-protected sale cleared at a real yield of 2.653%. On 15 September this desk wrote that a weak 20-year sale would be the first evidence that supply was joining the move. The 20-year cleared more than twenty basis points above August, and Wednesday's 5-year was reported weak. Supply has joined; we mark that call as confirmed.

We owe two marks against ourselves. Yesterday we set a test for the diesel argument: a margin over Brent below $95 a barrel within two weeks without an export ban. One session later it is near $98, down about $11. It moved because a policy premium came out of the product — the administration is now floating a voluntary cap — not because refining caught up, which is what the test was built to detect. But it moved, and the export-ban scenario that led yesterday's radar is marked down to low. The second mark is on mechanism. We argued the Fed would read the product price. Officials did lean hawkish — Collins backs a hike and Barr says further adjustments may be needed , and Valor reports the market now pricing two more increases this year — but the rates market repriced on growth on the day the product eased. Direction right, mechanism wrong.

Europe is pricing the same surprise through its sovereign spreads. Eurozone activity rose at its fastest pace in almost three and a half years, the Bundesbank's Nagel said the ECB may need mildly restrictive rates, and the France-Germany spread reached its widest since 2012 . The OECD warned the same day that surging bond yields are raising governments' interest bills. Strong growth that raises the cost of public debt faster than it raises tax receipts is not good news for every sovereign equally.

**What would prove this wrong.** September payrolls on 2 October at or below the 90k consensus with the five-year back under 4.85% in the same week would say the surveys ran ahead of the economy. A 7-year sale today that clears cleanly, followed by a curve steepening from the long end, would say supply rather than growth is in charge. Conviction is medium-high on direction and medium on the growth attribution.

**Method.** Tape figures are the settled session of 2026-09-23; the US cash session of 2026-09-24 had not settled when this was written and is not quoted. Brent, WTI, copper, natural gas and diesel are quoted at exchange settlement on the named contract month. The diesel margin converts the New York Harbor contract at 42 gallons a barrel and subtracts Brent; it is an indicator of refining tightness, not a refiner's realised margin. Auction figures are stop-out yields from our economic calendar; tails and bid-to-cover ratios are not in that record. Chokepoint and port figures are settled-dated.

Risk radar

What the desk is hedging.

high impactmedium prob.

Strong European growth turns into a sovereign-spread problem

The France-Germany spread has reached its widest since 2012 on a day of strong eurozone activity data, and the OECD is warning about rising government interest bills. The scenario is that a growth-led rise in yields becomes a question of which euro-area balance sheet can carry it, forcing the ECB to choose between the restrictive stance Nagel describes and the spread. Carried 21 September at medium probability and medium impact; impact raised because the spread has moved from a political to a market signal.

high impacthigh prob.

Mortgage borrowers reach for adjustable rates as fixed rates pass 7%

Nearly 10% of US mortgage borrowers chose riskier loan structures last week as rates rose above 7%, and the WSJ describes an expensive reckoning for apartment owners. The scenario this issue does not itself argue is the credit channel: a growth-led rise in the policy path moves adjustable-rate resets and floating apartment debt faster than it moves fixed mortgages. Carried 17 September at high probability and high impact; unchanged levels, trend rising because the long end has moved again since.

severe impactmedium prob.

An incident rebuilds the oil premium without any change in the flows

An attack on a vessel in the Strait of Hormuz killed an Indian sailor, Iran's president vowed no surrender, and countries are cancelling Iran flights under US pressure. Brent rose +3.86% while the engine's tanker-departure series showed Hormuz at 294 against a thirty-day mean of 301.3 — the premium came back on the incident, not the cargo. Carried 23 September at medium probability, severe impact and falling; trend now rising on the attack.

high impactmedium prob.

Credit markets price AI risk the analyst panel does not

Bloomberg reports Nvidia's credit default swaps among the most traded in the US market as demand for protection rises, while the analyst panel on 2026-09-23 carries Nvidia at 60 buys against 3 sells from 79 contributors. The scenario is that a higher discount rate reaches the debt-financed part of the AI build-out first — the lenders and the data-centre developers — before it reaches equity ratings. Carried 19 September at medium probability and high impact; unchanged.

medium impactlow prob.

A US diesel export restriction returns in voluntary form

The Energy Secretary rejected an outright diesel export ban and floated a voluntary cap, and the White House denied planning a ban. Diesel fell on the news. The residual scenario is a voluntary cap that still diverts supply from European and Latin American importers during the heating season. Carried 23 September at high probability and high impact; both marked down on the policy retreat.

On watch this week

  • The 7-year note auction on 24 September, against 4.512% at the August sale — the size of any tail is the tell for whether supply is joining growth.
  • Weekly jobless claims on 24 September: a jump would be the first hard number on the other side of the week's strong readings.
  • The spread between French and German ten-year debt, which Valor puts at its widest since 2012.
  • Whether the White House's retreat from a diesel export ban hardens into a voluntary cap or disappears.

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