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The Thirty-Year Treasury Is at 5.32 Per Cent and the Federal Reserve Has Not Touched a Thing

Long government borrowing costs are at multi-decade highs across the United States, Germany, France and Japan. The cause is not central bank policy. It is the sheer volume of debt being issued, and some of it is paying for data centres.

Outspoken Digest Business Desk

Tuesday, August 18, 2026/5 min read

The United States Treasury building in Washington
Photo: Carol M. Highsmith via Wikimedia Commons (Public domain)

Most people watch the wrong interest rate. They watch the one the central bank sets, because that is the one that comes with a press conference.

The rate that decides what a mortgage costs, what a government can afford, and whether a project gets built is the long one, and nobody sets it. It is discovered, every day, by people deciding what they will accept to lend money for thirty years. Today they are demanding a great deal more than they were, and the Federal Reserve has had nothing to do with it.

What is actually happening to bond yields?

The US thirty year Treasury yields around 5.32 per cent. The ten year is near 4.74 per cent, the highest in twenty months. That is the domestic picture, and on its own it would be a story.

It is not a domestic picture. CNBC reported this week that long dated government yields hit multi-decade highs simultaneously in the United States, Japan, France and Germany, with the Bloomberg Global Long Bond Index yielding around 4.2 per cent, its highest since July 2008. Germany's ten year bund is at a fifteen year high. Japan's ten year is above the levels it reached in the spring, having spent a generation near zero.

When one country's bonds sell off, that country has a problem. When every major bond market sells off in the same week, the problem is not any single country.

Why are yields rising if the central bank has not moved?

Because a bond yield is two things added together, and only one of them is policy.

The first part is what markets expect the central bank to do. The second is the term premium: the extra compensation a lender demands for locking money up for decades rather than rolling it over. That premium had been close to nothing for years. It is not close to nothing now.

Three things are lifting it at once.

  1. Supply. Governments across the G10 are running deficits that require them to issue more debt than the market comfortably absorbs. Every auction has to find a buyer, and the price of finding one is a higher yield.
  2. Inflation that will not settle. Fed Chair Kevin Warsh has warned publicly about inflation complacency and indicated that a rate rise is not his preferred instrument against it, which is a more unsettling combination for a bondholder than a straightforward hiking cycle would be.
  3. Energy. Brent is above $91 a barrel, up nearly 39 per cent over the year, after the June memorandum between the United States and Iran expired on Monday with no replacement. Oil feeds directly into headline inflation, which feeds directly into what a lender demands.

What does artificial intelligence have to do with your mortgage?

More than seems reasonable, and this is the part of the story that almost nobody is joining up.

An estimated $1.5 trillion of bonds have been issued by AI-linked companies this year. Data centres, power infrastructure, chips and the land underneath them are enormously capital intensive, and that capital is not coming out of retained earnings. It is coming out of the bond market.

Corporate bonds and government bonds compete for the same pool of savings. When one industry issues on that scale in a single year, it does not simply raise its own cost of capital. It raises everyone's, because there is only so much money looking for a fifteen year home and now there is a great deal more paper chasing it.

So the mechanism runs like this. A hyperscaler builds a data centre. It funds the build in the bond market. The extra supply pushes yields up across the curve. A family in a completely unrelated country pays more for a mortgage. Nobody involved would describe themselves as connected to anybody else in that chain.

Our reporting on GPU-backed financing for data centres traced how exotic some of this borrowing has become. This is the macro consequence of it.

What does this mean for the Gulf specifically?

It transmits almost perfectly, and that is worth stating plainly because it is often treated as a distant American story.

The dirham, the riyal and most currencies in the region are pegged to the US dollar. A peg means importing US monetary conditions whether or not they suit the local economy. When US long yields rise, the cost of project finance in Dubai and Riyadh rises with them, regardless of what regional growth or inflation is doing.

The offsetting factor is the same barrel of oil that is pushing yields up in the first place. Brent near $91 is uncomfortable for a bond market and comfortable for a Gulf budget. The region is one of the few places where the two halves of this story partly cancel out, which is a genuine structural advantage and is not the same thing as immunity.

Where it bites is the private sector. A contractor financing equipment, a developer funding a tower, a mid-sized firm rolling over a facility: all of them are paying the term premium set in New York, without the oil revenue that cushions the sovereign. It compounds the working capital squeeze we described in our piece on payment delays and cash flow.

What should a business actually do about higher yields?

Three things, none of which require a view on where rates go next.

Look at your refinancing calendar before you look at anything else. Debt maturing in the next eighteen months is the exposure that matters, because it will be refinanced at these levels rather than the ones in your original model. Anything maturing in 2029 is a problem for a version of you with more information.

Re-run project appraisals at a genuinely higher discount rate rather than the one in the template. A project that only works at a four per cent cost of capital is not a marginal project at five and a half. It is a different project, and often not one worth doing.

Then treat the oil price as the swing factor it is. Brent at $91 with a stalled negotiation behind it is not a stable number in either direction, and a business plan that needs it to stay exactly there is a business plan with one assumption doing all the work.

Gold, meanwhile, has risen 9.5 per cent this month in the face of the most competitive bond yields in twenty years, which our piece on what a gold price target is actually worth takes as its starting point. When an asset that pays nothing gains ground against one paying 5.32 per cent, somebody is worried about something the yield does not capture.

Published in The Outspoken Digest

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Companies, markets and the money moving through the region.

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