An analysis by a leading financial institution indicates that the persistent climb in US Treasury yields this year is not primarily a reflection of escalating sovereign credit concerns. Instead, the upward movement is largely driven by a repricing of the Federal Reserve's policy path, fueled by an AI-led economic resurgence and renewed inflation worries.

By breaking down the 10-year Treasury yield using the New York Fed's ACM model, the firm found that of the 48 basis point increase between January and August, a substantial 52 basis points came from higher expectations for future short-term rates. Interestingly, the term premium actually declined by 4 basis points during this period. This suggests the market is anticipating a more hawkish Fed, not demanding greater compensation for the risk of holding long-term bonds.

What is driving the surge in short-term rate expectations?

The rise in short-term rate expectations stems from two principal factors. First, the US economic outlook has improved, marked by vigorous AI capital expenditure, resilient consumer spending, and a robust jobs market. Second, inflation risks are resurfacing, prompting the Fed to maintain a tighter monetary stance. This shift in focus from employment to inflation was signaled by a more hawkish dot plot in June and reinforced by three officials voting for an immediate rate hike in July. Additionally, other pressures on the term premium emerged in July, including heavy corporate bond issuance, geopolitical tensions lifting oil prices, and large-scale Treasury auctions.

How significant is the impact of fiscal deficits?

While sovereign credit risk is not the primary driver of the recent yield increase, the fiscal situation is not without consequence. Government debt can lift yields through several channels, including the term premium, sovereign risk, and inflation expectations. However, research suggests the effect may be more limited than often assumed. Estimates indicate that a 1 percentage point rise in the government debt-to-GDP ratio only adds 2-3 basis points to the term premium. Based on the debt increase since late 2019, fiscal expansion can account for only about a quarter of the rise in the term premium and roughly 15% of the overall increase in yields. The larger part of the term premium repricing is due to a higher equilibrium real rate and increased inflation risk, not just credit worries. Looking ahead, the marginal impact of fiscal policy on future rates is uncertain, and while projections show the debt ratio continuing to climb, the corresponding estimated further rise in the term premium is moderate.

Interest rate normalization in the age of AI

The US macroeconomic environment has fundamentally shifted since the post-2008 era of low growth, low inflation, and low rates. The current AI-driven investment boom has resulted in strong corporate financing demand and is helping to push up the neutral rate of interest. The New York Fed's estimates show the trend growth rate has rebounded to around 2.5% and the real neutral rate has risen to a 1.5%-2% range. This transition is being described as a "normalization" of interest rates, marking a return to a more typical state after an unusual decade. Looking forward, the sustained AI investment cycle, the potential for the Fed to resume rate hikes to curb inflation, and the healthy state of private sector balance sheets all point to the likelihood that elevated yields are here to stay. From an investment perspective, high rates are not an unmitigated negative if they reflect a strong economy and corporate earnings, but they could pose a risk if they are driven by supply-side inflation and policy uncertainty. Notably, the S&P 500 has advanced roughly 12% over the same period that yields have climbed, demonstrating the market's current capacity to absorb higher rates.