Hard to See What Can Stop Upward Trend in Yields, BNP Paribas Says

U.S. Treasury yields on the 10‑year and longer maturities surged to their highest levels in more than three decades last week, prompting Isabelle Mateos y Lago, group chief economist at BNP Paribas, to warn that “it is becoming increasingly hard to see what could stop the upward trend in yields.” The rally reflects a confluence of fiscal and inflationary pressures that could reshape borrowing costs for governments, corporations, and households worldwide, while setting the stage for a closely watched Jackson Hole speech by former Federal Reserve governor Kevin Warsh on Friday.

Why Long‑Dated Yields Have Spiked

The recent surge in long‑dated yields is rooted in market expectations that the United States will need to finance a widening fiscal gap without the benefit of a significant slowdown in inflation. Bond investors have priced in higher real rates to compensate for the perceived erosion of purchasing power, while also demanding a premium for the risk of larger future debt issuances. The result is a steepening of the yield curve, with the 10‑year Treasury yield climbing above 4 % and the 30‑year benchmark approaching levels not seen since the early 1990s.

From a technical standpoint, the move reflects a shift in the supply‑demand balance. Treasury auctions have faced robust demand in the past, but the anticipation of larger, more frequent issuances has begun to outpace appetite, especially among foreign central banks that have been net sellers of U.S. debt. At the same time, the Federal Reserve’s policy stance—keeping short‑term rates elevated to combat inflation—has limited the “flight‑to‑safety” dynamic that usually supports long‑term yields when markets are risk‑averse.

In addition, the bond market is reacting to a broader re‑pricing of risk across asset classes. Equity valuations have been pressured by higher discount rates, prompting investors to rotate out of growth‑oriented stocks and into assets that can better preserve capital in a high‑rate environment. This rotation further fuels demand for higher yields as a benchmark for risk‑adjusted returns.

Fiscal Deficits and Inflation: The Dual Pressure

Mateos y Lago highlighted two structural forces that are unlikely to abate in the near term: a ballooning fiscal deficit and persistent inflation. The United States’ budgetary outlook has been deteriorating, with projected deficits expanding due to a combination of expansive fiscal stimulus, entitlement spending, and a slower‑than‑expected economic rebound. Higher deficits translate into larger Treasury issuance, which, absent a corresponding surge in demand, pushes yields upward.

Simultaneously, inflation has proved more stubborn than many policymakers anticipated. Core price pressures have remained above the Federal Reserve’s 2 % target, driven by supply‑chain bottlenecks, elevated energy costs, and wage growth in certain sectors. Persistent inflation erodes the real return on fixed‑income securities, compelling investors to demand higher nominal yields to maintain their real purchasing power.

The interaction between fiscal and inflationary dynamics creates a feedback loop. Larger deficits can exacerbate inflation if the additional spending fuels demand, while higher inflation can force the Treasury to issue more debt to cover rising interest costs on existing obligations. This loop is a central concern for market participants who fear that yields could climb further if neither the fiscal trajectory nor inflationary pressures are brought under control.

Policy Outlook: Jackson Hole and the Fed’s Next Moves

The upcoming Jackson Hole symposium, traditionally a platform for senior central bankers to outline monetary policy direction, will be closely scrutinized for signals from Kevin Warsh. While Warsh is not the current Fed chair, his remarks often influence market expectations about the Federal Reserve’s stance on rates and balance‑sheet normalization.

Analysts anticipate that Warsh will address three key themes: the sustainability of the current yield trajectory, the Fed’s willingness to adjust policy if inflation proves more entrenched, and the potential for fiscal‑policy coordination to mitigate market volatility. A dovish tone—suggesting a willingness to pause rate hikes—could temporarily calm yields, but Mateos y Lago warned that “any relief would likely be short‑lived without concrete fiscal reforms.” Conversely, a hawkish outlook emphasizing continued rate firmness would reinforce the upward pressure on yields.

Beyond the Jackson Hole speech, the broader policy horizon includes the Federal Reserve’s upcoming meetings, where decisions on the pace of rate hikes and the size of its balance‑sheet runoff will be critical. Market participants will be watching for any indication that the Fed is prepared to tolerate higher inflation temporarily in order to avoid destabilizing financial markets, a stance that could further entrench the current yield environment.

• Long‑dated U.S. Treasury yields have reached multi‑decade highs, reflecting higher real‑rate expectations.
• Expanding fiscal deficits are increasing Treasury supply, putting upward pressure on yields.
• Persistent inflation forces investors to demand higher nominal yields to protect real returns.
• Kevin Warsh’s Jackson Hole speech will be a key barometer for future Fed policy direction.
• Without fiscal consolidation or a credible path to lower inflation, the upward trend in yields is likely to continue.

Looking ahead, the trajectory of U.S. yields will hinge on whether policymakers can break the dual cycle of fiscal expansion and stubborn inflation. If the Jackson Hole dialogue signals a coordinated approach—combining disciplined fiscal measures with a clear monetary strategy—markets may find a floor for yields. Absent such coordination, the upward momentum is poised to persist, reshaping financing costs across the global economy and compelling investors to recalibrate risk assessments for the years ahead.