U.S. Bond Selloff Faces a New Complication as Investors Reassess the Economy’s Neutral Rate

U.S. Bond Selloff Faces a New Complication as Investors Reassess the Economy’s Neutral Rate

The recent weakness in U.S. government bonds may be about more than inflation, fiscal concerns or expectations for Federal Reserve policy. Investors are increasingly considering whether a little-known economic concept known as R-star is moving higher — a development that could keep interest rates elevated for longer.

R-star, also called the neutral interest rate, represents the level of real interest rates at which monetary policy is considered neither stimulating nor restraining economic activity. Although it cannot be observed directly, economists use estimates of the rate to judge whether central-bank policy is tight or accommodative.

That makes the latest debate significant for financial markets. If the neutral rate has structurally increased, investors may have to adjust to a world where interest rates remain higher than previously expected, putting additional pressure on bond prices and borrowing costs.

R-star Has Been Trending Higher

The New York Federal Reserve's widely followed Laubach-Williams model estimated R-star at 1.65% in the second quarter of 2026, compared with 1.36% in the first quarter of 2025. The latest reading was slightly below the 1.73% estimate recorded during the first quarter of this year.

The figures, however, should not be interpreted as a precise measurement of where the neutral rate actually stands. R-star is notoriously difficult to calculate, and estimates can differ depending on the model, assumptions and time period being examined.

Market participants nevertheless believe the current neutral rate could be higher than the latest official estimate.

One reason is the extraordinary amount of capital being directed toward artificial intelligence infrastructure. Technology companies are spending heavily on data centers, computing capacity and other infrastructure required to support the rapid expansion of AI.

At the same time, the U.S. government continues to borrow substantial amounts of money. The combination creates unusually strong demand for capital from both the public and private sectors.

AI Investment Adds to Demand for Capital

The AI investment boom is becoming an increasingly important factor for financial markets.

Large technology companies, including Amazon, Microsoft and Google's parent Alphabet, have been raising money through the bond market to support their infrastructure spending. Their debt issuance adds another source of supply to the market for longer-term bonds.

That matters because these companies are competing with the U.S. Treasury and other borrowers for investor capital. When the supply of long-duration debt increases, investors may demand higher yields to hold it.

Higher yields mean lower bond prices, creating another source of pressure in a market already dealing with concerns about government borrowing and monetary policy.

Analysts cited in the report suggest that strong AI-related investment could itself contribute to a higher neutral rate by increasing the economy's demand for capital.

Longer-Term Treasury Yields Under Pressure

A higher R-star could affect different parts of the Treasury yield curve in different ways.

Shorter and intermediate maturities, particularly two- and five-year Treasuries, could face upward pressure because a higher neutral rate would imply that the Federal Reserve may ultimately need to maintain a higher policy rate.

The 10-year Treasury yield can also be affected. Investors consider both expectations for future short-term rates and the additional compensation they require for holding longer-duration debt, commonly referred to as the term premium.

The impact could be particularly significant at the long end of the curve.

The 30-year Treasury yield is especially sensitive to concerns surrounding the country's elevated debt burden and persistent fiscal deficits. If investors believe the economy's neutral rate has shifted higher while government borrowing remains heavy, long-term borrowing costs could remain under pressure.

What It Means for the Federal Reserve

The debate over R-star presents another challenge for the Federal Reserve.

If the neutral rate is higher than policymakers previously assumed, the Fed could find that a policy rate considered restrictive in the past is no longer as restrictive as expected. That could make it harder for the central bank to reduce rates without risking renewed inflationary pressure.

It also complicates the market's expectations for future rate cuts.

The Federal Reserve is already assessing an economy in which inflation remains above its 2% objective while investment linked to AI remains exceptionally strong. Government borrowing adds another source of demand for capital.

This combination means that even if the Fed pauses, financial conditions may not return quickly to the exceptionally low-rate environment seen in earlier periods.

Could the Effect Eventually Reverse?

There is also an important counterargument.

The increase in capital spending associated with AI may not permanently push the neutral rate higher. If AI technology eventually produces large productivity gains and reduces costs across the economy, it could have a disinflationary effect.

That could eventually allow interest rates to move lower.

The timing, however, remains uncertain. The current investment surge is still unfolding, making it difficult to determine whether it represents a lasting transformation of the economy or simply another investment cycle that will eventually cool.

Economists may need years of additional data before they can establish whether the recent rise in R-star represents a genuine structural change.

A New Variable for Bond Investors

For now, the R-star debate provides another explanation for why Treasury yields have remained elevated.

Bond investors are simultaneously dealing with heavy government borrowing, increased corporate issuance, strong AI-related capital spending and uncertainty over the Federal Reserve's future policy path.

The neutral rate does not provide a simple answer to where yields should be. Its estimates remain uncertain, and several forces are influencing the bond market at the same time.

But if R-star is genuinely moving higher, the implications could extend well beyond Wall Street. Higher long-term interest rates can increase borrowing costs for households, businesses and governments, affecting mortgages, corporate financing and the cost of servicing public debt.

For investors, the central question is therefore no longer simply whether inflation will fall. It is whether the U.S. economy has entered a period in which the underlying cost of capital itself is higher.

That question could remain central to the Treasury market as policymakers and investors assess how much of the recent rise in yields is temporary — and how much reflects a lasting change in the economic landscape.