Scrutica
WSTS Blue Book monthly billings (1986–2026) by region with 3-month-moving-average phase classification, Epoch AI quarterly GPU shipment volumes (H100-equivalent), and BIS export-control event markers on one time axis. The industry’s 3–4-year boom-bust sets fab-utilization caps that translate to near-term ceilings on AI training infrastructure; troughs ease them. The same axis anchors when each AI-relevant regulatory action landed — controls imposed during contractions carry different trade effects than those imposed during booms. Phase boundaries are rule-defined (expansion / peak / contraction / trough), with no model fitting.