Why Japanese Yen (JPY) fell 0.60%
Japanese Yen (JPY) fell 0.60% on September 12, 2026 — US CPI hikes Fed odds; yen weakens on yield gap.
What happened
US CPI data raised near-term odds for a Fed rate hike, widening the yield differential between US Treasuries and Japanese Government Bonds.
Why it moved
Higher US rates increase carry-trade appeal into USD/JPY; the yen weakens as capital flows chase wider dollar yields and the cost of yen-funded positions rises, pushing JPY lower on pure rate differentials.
Why it matters
Within the dollar regime supercycle, the yen is structurally vulnerable to US monetary tightening—today's CPI-driven hawkish re-pricing of Fed action widens the spread that penalizes the yen relative to the dollar.
What would break the thesis
If US yields fall back toward pre-CPI levels or the BOJ signals hawkish tightening of its own, the yield gap narrows and yen weakness stalls or reverses.