Is the AI infrastructure boom creating unsustainable concentration in computing investment?
Core argument: The buildout is not a broad-based tech investment but a narrow, concentrated bet by a small number of hyperscalers.
I have written about the sharply growing role of AI capex in US GDP growth, but it is now becoming material in GDP outright. [An Epoch figure shows] the ongoing AI infrastructure buildout has compressed a decade of capital spending into about two years. Computing infrastructure's share of nominal US GDP sat near 0.5% for most of the 2015–2022 period, with a gentle upward trend. Then it broke sharply upward around 2023, nearly tripling to approach 1.6% of GDP by 2026. This was driven almost entirely by AI-related compute hardware, data center construction, and networking layered on a non-AI compute data center base that never moved. Non-AI compute hardware (~0.66% of GDP) has barely budged. The entire increment is AI-specific. The buildout is not a broad-based tech investment but a narrow, concentrated bet by a small number of hyperscalers. This concentrates both the upside and the systemic risk.

