How much of U.S. GDP growth comes from AI capital spending?
Core argument: AI capex contributed an estimated 0.6 to 1.3 points of the 3% U.S. GDP growth in the quarter, with the high end implying roughly 40% of that growth, based on BEA data on IT equipment and intellectual property products.
The key data point is IT spending (IT equipment and IP products) [while the] two categories were not entirely AI-capex-related, obviously. But a significant fraction was, certainly more than half, given their anomalous size and growth in the BEA Q2 numbers. Summing it, a reasonable estimate is that AI capex contributed perhaps 1.3% of the 3% GDP growth in the quarter, around 40%. We can back into the estimate another way, bottoms-up from known AI capex at major tech companies spending in the period. Taking just Google, Amazon, Meta, and Microsoft, and their quarterly earnings and published data, they spent around $69B in the quarter, which is $276B annualized. Total IT equipment spending in the quarter was $608B annualized, so the Big Four alone were almost half of the spending, and most of that, we know, was AI capex. Given that information processing equipment spending added 1% to GDP growth in the quarter, from the BEA's own figures, then AI capex, including both software and equipment, was at least 0.6% in that. We now have a range: AI capex's contribution to Q2 growth was somewhere between 0.6% (on the low end, undercounting smaller players) and 1.3% (on the high end).



