Insights 
VT 
The Japanese yen has weakened as the new week begins, influenced by Prime Minister Shigeru Ishiba’s resignation. The USD/JPY rate is now approximately 148.22, up from around 147.35 late on Friday.
Other yen pairs also show increases, with EUR/JPY reaching approximately 173.45. Ishiba’s resignation followed mounting pressure within his party to assume responsibility for a historic electoral defeat.
Political Unrest And Economic Implications
Ishiba assumed office in October 2024, but his ruling coalition has since lost majorities in both the lower and upper parliamentary houses.
With Prime Minister Ishiba’s resignation introducing significant political uncertainty, we should expect continued yen weakness. The immediate move in USD/JPY towards 148.25 is likely just the beginning of a larger trend driven by a lack of clear leadership. For derivative traders, this points towards strategies that benefit from a falling yen, such as buying USD/JPY call options or selling yen futures.
This political turmoil makes it very difficult for the Bank of Japan to act on recent economic data, which showed core inflation for August 2025 holding at a stubborn 2.8%. With the U.S. Federal Reserve funds rate steady at 4.75%, the wide interest rate difference that fuels the yen carry trade is now reinforced by this policy paralysis in Tokyo. We anticipate the BoJ will remain on hold through this leadership transition, adding further downward pressure on the yen.
The uncertainty surrounding Ishiba’s successor will likely increase market volatility in the coming weeks. We are already seeing one-month implied volatility for USD/JPY options rise from under 9% last week to over 11%, indicating traders are pricing in larger price swings. This environment could make strategies like long straddles attractive, as they can profit from a significant move in either direction once a new policy path becomes clearer.
Historical Context And Future Outlook
Looking back, we saw a similar dynamic between 2022 and 2024, when a widening policy gap caused a historic slide in the yen. The current political instability removes a key source of government pressure that had been supporting the currency. This suggests the path of least resistance is for the yen to weaken further, possibly re-testing the multi-decade highs in USD/JPY seen in late 2024.
