Here we go, we were waiting for these. A senior Japan Ministry of Finance official:
- no comment on every day-to-day forex moves
And then, he does:
- sudden FX fluctuations are not desirable
- volatility is rising in recent forex market
- watching FX moves with a high sense of urgency
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This is standard sort of 'jawboning' (ie talking up the yen) intervention. BOJ and MoF officials do this when the yen falls quickly, as it has done:
