AI Infrastructure Boom Pushes Treasury Yields Higher

AI debt surge reshapes bond markets

Artificial intelligence companies are issuing corporate debt at unprecedented levels to finance data centers and chip purchases, creating an unusual dynamic in bond markets that is pushing up Treasury yields. This phenomenon represents a reversal of the traditional crowding-out effect economists have long warned about with government debt.

U.S. investment-grade corporate bond issuance reached approximately $1.7 trillion through July, running 27% ahead of last year's pace and on track to exceed $2 trillion for the first time, according to Wall Street veteran Ed Yardeni. Much of this surge stems from AI hyperscalers racing to build infrastructure.

Treasury Secretary Scott Bessent has observed that AI companies appear willing to borrow regardless of cost. "A lot of that corporate issuance, I would say, is almost yield-agnostic, because the build-out for AI, the returns on that, the companies believe they're going to be so high. They don't really care what they're paying," Bessent said recently.

The reverse crowding-out mechanism

Traditionally, economists worried that excessive government borrowing would crowd out private investment by absorbing available capital. With U.S. debt now at $40 trillion and annual debt servicing costs hitting $1 trillion, those concerns seemed well-founded.

But the AI boom has flipped the script. Despite the flood of corporate debt, demand for AI-related bonds has remained so strong that yield spreads over Treasuries have barely widened. Instead, Treasury yields themselves have risen as capital flows into corporate bonds rather than government debt.

"The market has adjusted not through higher corporate borrowing costs relative to Treasuries but through higher Treasury yields themselves," Yardeni explained in a Monday note. "Capital flowing into corporate bonds is capital not flowing into Treasuries, and Treasury yields have had to rise to clear the market."

International capital-flow data support this analysis, showing that private-sector foreign buyers have purchased more U.S. corporate bonds than Treasury debt over the past year.

Why it matters

This dynamic creates a potential feedback loop for federal finances. Rising Treasury yields increase government debt-servicing costs, which expand budget deficits further and require more borrowing—potentially pushing yields even higher. With the federal deficit on track to reach $2 trillion this fiscal year, the government's borrowing needs remain massive even as it competes with AI companies for capital.

Federal Reserve Chairman Kevin Warsh acknowledged the trend at the Jackson Hole conference, noting that "ever-expanding pools of capital are pouring into AI-related infrastructure of all sorts." Private credit is also financing the AI boom, while chipmaker Nvidia is leveraging its balance sheet to back AI deals. One estimate puts so-called hidden borrowing at $1.65 trillion.

Market fatigue emerging

Some signs suggest markets are reaching capacity limits. S&P Global warned last month that hyperscalers are paying higher premiums compared with risk-free bonds, and that "market participants are growing leery of quickly rising leverage from issuers previously characterized by strong and reliable cash flow."

Multiple factors beyond AI debt are driving Treasury yields higher, including persistent federal deficits, elevated oil prices due to conflict with Iran, and continued inflationary pressure from a robust economy. But the corporate debt surge represents a new and significant force in bond markets.

These details were first reported by Fortune, drawing on analysis from Ed Yardeni and other market observers.