It’s a good thing that Nvidia’s Q4 2025 earnings beat expectations yesterday, because an increasing portion of U.S. GDP growth is coming from AI capital expenditures (capex) and the “wealth effect” from tech stock gains on consumer spending, according to new analysis from Pantheon Macroeconomics.
AI capex “accounted for nearly a fifth of the 2.2% year-over-year increase in headline GDP in Q4,” Pantheon’s Samuel Tombs and Oliver Allen said in a note to clients this morning.
In addition, the value of household holdings of Magnificent Seven tech stocks increased by $3.8 trillion in 2025, they estimate. Using historical trends as a guide, that increase in wealth drove an increase in consumption by 0.4 percentage points in Q4 2025, adding 0.3 points to GDP growth, they said. (The “wealth effect” is the phenomenon that describes how consumers tend to increase their spending when they feel richer owing to a rise in the value of their houses or investments.)
All told, “AI-linked capex and the wealth effect from gains in tech stocks probably accounted for a third of headline GDP growth towards the end of last year,” they said.
