Penn economist's paper: low saving could cut AI-driven growth from 11.7% to 2.2%
Afinetheorem · x · 2026-10-20
Economist Jesús Fernández-Villaverde (UPenn, CEPR, NBER) released a draft paper, "Saving for the Machines," asking who will fund the capital AI requires, from data centers to power plants.
Key findings:
- The same technology path yields 11.7% annual growth with optimal household saving, but only 2.2% when the saving rate is fixed at the calibrated 2025 US level of 23% — slow growth may reflect insufficient capital accumulation, not a technological bottleneck.
- Automation shifts tasks from labor to machines, raising the capital share, which drives the saving rate up — thriftiness isn't the cause.
- Long yields price the boom: the 10-year real yield jumps from 5.1% to 13.6% on impact.
- Distributionally, hand-to-mouth households lose the equivalent of two-fifths to two-thirds of consumption, while keeping them on trend temporarily costs at most a fifth of GDP.
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