US economy runs hot as GDP growth outpaces borrowing costs

September 27, 2026 at 10:24 PM2 min

This digest was compiled by AI from multiple sources — links to the originals are below.

The U.S. economy is running hot, with nominal GDP growth above 6% outpacing the 5.16% 10-year Treasury yield. Federal Reserve policymakers hiked interest rates earlier this month to rein in inflation, while the AI boom drives capital expenditures projected at $870 billion this year. The $40 trillion federal debt burden and $2 trillion annual deficit add pressure even as growth accelerates.

Key Facts

Nominal U.S. GDP growth is well above 6%, exceeding the 5.16% 10-year Treasury yield.
Capital expenditures from Alphabet, Amazon, Microsoft, Meta, Oracle, and SpaceX are projected to total $870 billion in 2026, up from $470 billion in 2025.
S&P Global estimates hyperscaler spending will exceed $1.3 trillion in 2027.
The federal government runs a $2 trillion annual budget deficit, acting as additional stimulus.
U.S. business activity for September hit a five-year high, according to a recent gauge.

Growth and Debt Dynamics

The U.S. economy has absorbed shocks from President Donald Trump's tariffs and the war on Iran while continuing to run hot. Federal Reserve policymakers hiked interest rates earlier this month to rein in inflation, recognizing the economy is thriving. The prospect of a hot economy adding inflationary pressure has sent Treasury yields soaring, increasing the burden of servicing $40 trillion in U.S. debt. For now, GDP is staying ahead of interest rates, with nominal growth well above 6% compared to the 5.16% 10-year yield. Growth in the third quarter could show further acceleration, as a September gauge of U.S. business activity hit a five-year high.

AI Investment Boom

The AI boom is a major driver, with capital expenditures from Alphabet, Amazon, Microsoft, Meta, Oracle, and SpaceX projected at $870 billion this year, up from $470 billion in 2025. S&P Global estimated last month that spending from the handful of hyperscalers will exceed $1.3 trillion in 2027. Economist Stijn van Nieuwerburgh says the AI build-out is on track to top the railroad mania as the biggest boom in U.S. history. Industrial stalwarts like Caterpillar and GE have been among the biggest beneficiaries of the data center frenzy. UBS economist Jonathan Pingle wrote that the breadth and magnitude of the AI investment impulse spilling over to other sectors is as surprising as it is extensive.

Fiscal Stimulus and Risks

The federal government's $2 trillion annual budget deficit represents additional stimulus, with much of the money going into consumers' pockets via entitlement payments. Research Affiliates said in a note early this year that this eventually boosts profits and stock valuations. Some Wall Street analysts have warned that the AI bubble is poised to pop soon, hobbling the economy's hottest engine. Instances of AI agents going rogue and fears the technology could wipe out humanity have led to calls for slowing development and perhaps less investment. Higher borrowing costs could also cool AI spending.