Over the past two years, the consensus amongst many strategists has repeatedly fallen into the same trap: expecting a rapid retreat to the post-2008 era of near-zero real interest rates. Wall Street forecasted that sticky borrowing costs would inevitably crack consumer spending, crush corporate balance sheets, and force global central banks into aggressive easing cycles.
Instead, government bond yields from Frankfurt to Tokyo and Washington have stubbornly drifted higher. While financial commentators frequently blame persistent core inflation or fiscal profligacy, a more fundamental mechanism is at work: markets have consistently underappreciated underlying GDP growth expectations.
When potential trend growth shifts upward, the target interest rate that keeps the economy in balance must increase with it. If central banks cut rates prematurely while the economy is running hot, they risk overstimulating already resilient economies. In our opinion, bond investors are finally repricing for a structural regime shift: the global economy is simply growing faster than what most strategists anticipated.
The Sovereign Shift: Who Owns America’s Debt?
Rising rates are not occurring in a vacuum; they interact directly with government debt supply and global demand dynamics. According to the U.S. Department of the Treasury’s Treasury International Capital (TIC) data and the Federal Reserve Board’s Financial Accounts of the United States (Flow of Funds), total U.S. public debt outstanding has surpassed $40 trillion.
Historically, foreign buyers, predominantly sovereign central banks and foreign official institutions, anchored yields for bonds maturing far into the future. However, their total ownership has shrunk noticeably:
- Foreign Central Bank De-Risking & Currency Intervention: Foreign official institutions, particularly in East Asia, have reduced their rate of net purchases or allowed existing Treasuries to roll off without reinvestment. In Japan—historically the largest foreign holder of Treasuries—the Bank of Japan’s gradual normalization of monetary policy and the Ministry of Finance’s domestic currency defense operations have curtailed appetite for foreign bonds.
- Foreign Commercial Bank Constraints: Foreign commercial banks and institutional asset managers face punishing foreign-exchange (FX) hedging costs. When short-term rate differentials make currency-hedged yields on U.S. Treasuries lower than domestic local-currency yields, foreign banks find better risk-adjusted returns at home.
- The Rise of Domestic Price-Sensitive Buyers: With foreign institutions taking down a smaller fraction of newly issued debt, private domestic market participants—mutual funds, pension funds, hedge funds, and household accounts—must absorb massive Treasury issuance. Because these investors lack the non-economic, currency-reserve mandates of central banks, they require higher term premiums and wider yields to lock up their capital.
The Capex Pivot: From AI Infrastructure to Productivity
A primary engine driving recent U.S. outperformance and upward revisions to potential Gross Domestic Product (GDP) has been the unprecedented surge in corporate capital expenditures (capex) dedicated to artificial intelligence.
Leading hyperscalers and mega-cap technology firms such as Microsoft and Alphabet (Google) have poured hundreds of billions of dollars into high-performance GPUs, specialized data centers, custom power infrastructure, and cooling utilities. This investment wave has acted as an old-fashioned physical stimulus across industrials, power generation, and semiconductor supply chains, directly lifting fixed investment components in headline GDP.
However, historical investment cycles—from the mid-19th-century railway mania to the late-1990s fiber-optic boom—remind us that infrastructure buildouts do not expand indefinitely.
Eventually, the initial hardware deployment phase reaches saturation. When hyper-scale capex moderates, the headline GDP growth driven by physical machinery and construction spending will naturally cool. If viewed solely through an industrial accounting lens, this moderation would signal an economic deceleration, theoretically lowering yields and potentially causing an economic recession.
The Productivity Offset: The Real Driver of Structural Rates
The crucial point to focus on, however, is what happens after hardware spending peaks. The slowdown in hardware procurement will likely be counterbalanced by the deployment of software-driven productivity gains across the broader economy.
As enterprises shift from buying infrastructure to integrating operational AI workflows:
- Total Factor Productivity (TFP) Expands: Sectors once constrained by linear labor costs—such as legal services, software engineering, customer support, diagnostics, and financial modeling—can achieve higher real output per hour worked.
- Non-Inflationary Growth Unlocks: Unlike demand-driven booms that strain supply chains and ignite consumer prices, productivity-driven expansions lift potential supply capacity. An economy could sustain above-average real growth without generating runaway demand-pull inflation.
- Higher Real Rates Become Sustainable: When the marginal return on invested capital remains elevated due to structural efficiency, capital remains scarce and in high demand. Businesses can readily absorb 4.5% to 5.5% benchmark borrowing costs because their return on investment is substantially higher.
Generally speaking, we view higher interest rates as somewhat justified not because the economy is in trouble, but because it is surprisingly energetic.
Three main forces explain what is happening:
- Smarter, Faster Growth: The economy is running hotter than expected. While big tech will eventually stop spending billions just building data centers and buying chips, regular businesses will start using those AI tools to get more done with fewer resources. That keeps the economy strong and profitable over the long haul.
- Capital Is in Demand: When companies can earn solid profits from being more productive, they are willing to pay more to borrow money. That naturally keeps benchmark rates up.
- Fewer Automatic Buyers for U.S. Debt: Foreign banks aren’t snapping up U.S. government bonds like they used to, partly because it has gotten expensive to hedge currency risk and partly because they have better options at home. To convince everyday private investors to buy all those bonds instead, the U.S. government has to pay a higher payout (yield).
The ultra-low interest rates of the 2010s were an anomaly, not the default. As long as economic efficiency stays high and the supply of government debt remains massive, higher borrowing costs could simply be the new normal.
