AI as Fourth Production Age

The author maps human history into three production eras (stone, agricultural, industrial) and argues AI could inaugurate a fourth by automating cognitive work like engines mechanized physical work. He cites rapid capability benchmarks (o3 at 'grandmaster' on Codeforces; METR’s task‑length doubling every seven months) and massive GPU/energy build‑outs as evidence that sustained double‑digit global GDP growth is plausible. — Treating AI as a new production mode reframes growth forecasts and priorities for energy, infrastructure, education, and governance.