September 2, 2026

The Central Bankers Said It Out Loud

The people who set interest rates spent the week talking about AI. The head of the world's financial stability board warned of a debt-fueled correction, the Fed chair hinted at a hike, and Australia's Treasury said the data center boom itself pushes rates up.

The facts:

• Andrew Bailey, governor of the Bank of England and chair of the global Financial Stability Board, wrote to G20 finance ministers that borrowed money piled on top of "stretched asset valuations" in AI, and the web of cross-investment between AI companies and cloud giants, "could amplify a future market correction" that spreads across borders (Sydney Morning Herald, The Independent, The Decoder)
• The same letter calls frontier AI's effect on cyber risk "the most immediate concern" for the financial system (Reuters via Yahoo Finance, The Record)
• Nvidia, valued above $5.2 trillion, recently raised $500 billion from a group of US banks and investors; its stock is up about 850% in five years (Sydney Morning Herald)
• US investment-grade companies issued about $1.7 trillion of bonds through July, 27% ahead of last year's pace; the Treasury Secretary called much of it "almost yield-agnostic" because AI builders "don't really care what they're paying" (Fortune)
• Ed Yardeni's read: that flood of corporate borrowing is pulling buyers away from Treasuries, so Treasury yields have had to rise to clear the market, "a classic crowding-out effect" (Fortune)
• Federal debt is $40 trillion, this year's deficit is on track for $2 trillion, and interest alone costs $1 trillion a year (Fortune)
• Goldman Sachs doesn't expect AI supply and demand to balance until the first half of 2028; Alphabet raised this year's capital spending guidance to $195 to $205 billion, and SpaceX spent $18.4 billion in one quarter against estimates of about $6 billion (Yahoo Finance)
• Fed chair Kevin Warsh used his Jackson Hole speech to say underlying inflation hasn't "meaningfully improved," with the Fed's preferred measure at 3.7%; market odds of a rate hike at the September 15-16 meeting jumped from about 35% to nearly 60% (AP via WTOP, Yahoo Finance)
• The three biggest one-day moves in the Treasury yield curve since Warsh took over in May have all followed his own appearances (Bloomberg)
• Australia's Treasury says the data center boom could push up the "neutral" interest rate as tech companies compete with governments for capital and workers; Australia's central bank has already hiked three times this year, home values there are falling in 93% of city suburbs, and AMP expects a 10% peak-to-trough drop, the worst since the war (Sydney Morning Herald, ABC Australia, The Guardian)

Interest rates used to be a story about inflation, a meeting, and a person at a podium. This week the person at the podium, the regulator who writes to the G20, and a treasury on the other side of the world all told the same story, and it was about AI.

Start with the plumbing. Companies building data centers are borrowing at a pace nobody's seen, and the Treasury Secretary, whose job is selling government debt, says out loud that they'll pay whatever it costs. Money that goes into an Amazon bond is money that didn't go into a Treasury bond. So the Treasury has to offer more to find buyers. That's the Yardeni argument, and the numbers back it: $1.7 trillion of corporate bonds in seven months, foreign buyers picking corporate paper over government paper, Treasury yields grinding up while the spread between the two barely moves.

Then the Fed. Warsh went to Jackson Hole and, in the polite language that job requires, said inflation is still too high and the summer's better readings don't convince him. Traders heard "hike." The bond market has moved more on his three appearances than on anything else since May, which is funny for a man whose stated goal is to have the market stop watching him.

the letter from London

Bailey's letter is the one to read twice. He runs the board that coordinates financial regulators worldwide, and he chose to spend it on two things.

One: leverage. Not just that investors are borrowing to buy AI stocks, but that the borrowing sits on top of very high valuations in a very small number of companies that also invest in each other. Nvidia puts money into the labs, the labs buy Nvidia's chips, the cloud providers borrow to build the buildings the chips go in. He calls that cross-investment a channel that "could amplify a future market correction." If one link breaks, the selling doesn't stay in one place.

Two: the hacking. He put frontier AI's effect on cyber risk above everything else as the most immediate concern for the financial system, the same week the labs published their own reports on their models breaking into other companies. The banks all run on a handful of the same providers. One good attack lands everywhere at once.

the Australian preview

Australia is a few steps ahead on this path and worth watching for that reason. Its Treasury just said in writing that the data center boom can raise the neutral rate, because tech companies are competing with the government and everyone else for capital and workers. Its central bank has hiked three times this year. House values there have fallen five months running, in 93% of city suburbs, and the mainstream forecast is a 10% drop top to bottom, with another hike expected anyway because inflation is "the main game."

That's the sequence to hold in your head: AI spending, more borrowing, higher rates, house prices down, and the central bank hiking into it because prices are still rising.

There's a respectable argument that AI eventually pushes long rates down either way: if it works, it's deflationary; if it flops, money hides in Treasuries. Maybe. This week the decision the market made was about the bill for building it, and that one's due first.

The Fed meets on September 15.

Sources: Sydney Morning Herald, The Independent, The Decoder, Reuters via Yahoo Finance, The Record, Fortune, Yahoo Finance, AP via WTOP, Bloomberg, ABC Australia, The Guardian.