Oil fell. Long-term borrowing costs rose anyway.

The test we set ourselves on Thursday had two halves: a Hormuz deal that pulled crude down, and a thirty-year that fell further than the five-year in response. On Friday the first half arrived without the deal. Iran's foreign minister offered a plan to reopen the strait within seven days; the White House, by the same report, wants a broader agreement that covers the nuclear programme. Brent fell 2.14% to $104.32 and WTI 2.33% to $92.41. The five-year eased to 5.01%. The thirty-year rose to 5.50%, a fresh high since 2004, and the 5s30s spread widened to 49 basis points from 43. Over the week the long bond rose 17 basis points.

That is the opposite of what an oil-driven long end would do. The far end of the curve carries most of a bond's compensation for future inflation; take out a piece of the oil premium and it should fall hardest. The front end behaved like an oil market. The long end behaved like a market being asked to absorb more paper than it wants at the price on offer. Gold and silver rose, but on a day the dollar softened and the yen jumped, and after falling through Thursday's selloff; they do not rescue an inflation reading.

We also owe a mark on the auction half of our 24 September test. The seven-year sold at 5.085% on Thursday, within a basis point of where the settled curve put it on our interpolation. There was no second weak sale. The supply case now rests on the curve's shape and on who is borrowing, not on a failed auction, which is weaker evidence than a failed sale would have been.

Who is borrowing is where the week turned. Equities rose on Friday, the Dow by 0.93%, and the analyst panel on Oracle is unchanged at 57 Buy, 26 Hold and 4 Sell. Credit is reading different documents. Oracle's force-majeure notice to the developer of its New Mexico campus has put data-centre loan and lease agreements under scrutiny; Brightline filed for Chapter 11 to cut nearly $6bn of debt; and eurozone bank lending to business halved in August after the ECB's increase. The Financial Times warns that sell-offs of this speed can start fires elsewhere in the system. The first place they tend to start is the balance sheet that funded a thirty-year asset with shorter money.

The yen supplied the other surprise. President Trump raised the currency's weakness with Prime Minister Takaichi, and the yen strengthened 0.94% to 157.28. On 25 September we put Japanese money returning home at the top of the radar; the currency just moved the way that scenario requires. Our 23 September diesel test stays fired: the margin over Brent held near $92 a barrel, below the $95 line, for a second session. The tokenised-bitcoin balance we flagged on 25 September did not fade — it more than doubled again, to $346m.

**What would prove this wrong.** A soft core PCE print on 30 September followed by a thirty-year that falls further than the five-year that week would hand the level back to inflation. So would 10-year and 30-year sales on 7 and 8 October that clear at or through the market with the 5s30s spread back under 40 basis points. Conviction is high that crude no longer sets the long end, medium on the supply attribution.

**Method.** Tape figures are the settled session of 2026-09-25. Brent, WTI, copper, natural gas, diesel and soybeans are quoted at exchange settlement on the named contract. The seven-year yield is not in our tape: it is interpolated from the settled five- and ten-year yields of 24 September, and the auction record carries no tail or bid-to-cover. The diesel margin converts the New York Harbor contract at 42 gallons a barrel and subtracts Brent. Positioning is the largest managed-money row per commodity for the week to 2026-09-22. US durable goods for August were due on 2026-09-25 but the result was not in our calendar at the time of writing and is not marked.