The BoJ and the Yen

On Thursday night, the yen jumped from around ¥162.80 to ¥157 against the dollar in about an hour. Japanese financial authorities intervened to prop up the currency, which had been trading near a 40-year low.  Friday’s Bank of Japan meeting confirmed the backdrop: the BOJ left its benchmark rate unchanged, having just raised it from 0.75% to 1% back in June.  Notably, hawkish board member Hajime Takata dissented, pushing for a hike to get ahead of inflation risks. This isn’t Japan’s first move this year. The first intervention reportedly came on April 30, after the yen breached the politically sensitive 160 level, the first yen-buying operation since July 2024.  The core problem hasn’t gone away: the wide interest rate gap between the Fed and the BOJ continues to fuel the yen carry trade, as investors borrow cheaply in yen to invest in higher-yielding currencies. The market verdict on intervention alone is skeptical. From a practical standpoint, the Intervention is buying time, not turning the tide; the real pivot has to come from the BOJ. Bit they’re likely paralyzed by the potential consequences. That’s why the line the Ministry of Finance is defending is probably a zone around 162-165, not a hard line in the sand. FX intervention can jolt price action for a day, but it can’t offset a 250+ bps rate differential on its own. Until that gap narrows, expect more of these “surprise” interventions, and more speculation about the BOJ’s next move.

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