A plain-English guide to when higher yields stop supporting the dollar.
The yield-differential model (higher UST yields pull dollar higher) works most of the time and breaks in three specific regimes. Regime 1: the yield move is term-premium rather than real-rate, so foreign capital does not rebalance into the dollar; signature is long-end steeper than front-end and TIPS breakevens widening. Regime 2: foreign policy repricing narrows the forward differential even when spot US yields rise; signature is a sharp move in the single pair with the policy news, other DXY components lagging. Regime 3: a crossflow shock (oil, terms of trade, reserves policy) changes the balance-of-payments arithmetic for the paired currency. The three regimes usually run together; separating them is the diagnostic skill. Tuesday September 8 delivered roughly 40/55/5 across the three.
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