Composite 0-100 metric. Four sub-indices: Demand (WSTS 3MMA YoY → Semiconductor Cycle), Concentration (CSET weighted HHI → Chokepoint Anatomy), Capacity (FRED CAPUTLG3344S utilization), Power (PJM DC-region queue/operational ratio → Compute Forecast). Default equal weights, adjustable. Monthly history from available data overlap. A single number capturing the concentration and capacity pressure in the AI compute supply chain right now, spanning semiconductor demand surges, factory utilization, production concentration, and power availability gaps. Higher numbers mean tighter conditions; the sub-components show exactly where the pressure is and which chokepoints policy can address.