Japan’s Finance Minister Satsuki Katayama announced plans for an upcoming economic stimulus package which is expected to be substantial. However, the exact size remains undisclosed due to ongoing discussions about financing and political sensitivities related to Japan’s public finances.
Currently, the USD/JPY pair shows a minor increase of 0.02%, reaching 155.25. The Japanese Yen, one of the most traded currencies globally, is influenced by the Bank of Japan’s (BoJ) policies, bond yield differentials, and trader risk sentiment.
Bank of Japan Policies
One key role of the Bank of Japan is currency control, occasionally intervening to depreciate the Yen. Between 2013 and 2024, an ultra-loose monetary policy led to a weaker Yen due to diverging policies with other central banks. However, the BoJ’s recent policy adjustments have supported the Yen.
The BoJ’s past ultra-loose stance widened the yield gap with the US, benefiting the US Dollar. In 2024, the BoJ started to reverse this policy, while major central banks initiated rate cuts, reducing this differential.
The Yen is regarded as a safe-haven currency during market stress, attracting investments for its reliability. During turbulent times, it typically gains value against riskier currencies.
Economic Stimulus and Market Implications
The government’s talk of a “sizable” economic package introduces significant uncertainty into the market. This kind of fiscal spending is typically inflationary and could weaken the Yen further. We believe this ambiguity will fuel volatility in the coming weeks.
With USD/JPY currently trading at 155.25, the Yen is already near historic lows against the dollar. We must remember the Ministry of Finance’s interventions back in 2022 and 2024 when the yen weakened past the 150 level, which shows a clear line of defense. This creates a risky environment for anyone betting on continued Yen weakness.
A large stimulus package might force the Bank of Japan’s hand, prompting a more aggressive unwinding of its loose monetary policy to fight inflation. This creates a direct conflict for the currency. Fiscal policy is pushing the Yen down, while the potential for tighter monetary policy could push it up.
Recent data supports the case for a more hawkish Bank of Japan, as Japan’s national core inflation has remained stubbornly above target, hitting 2.8% in October 2025. Meanwhile, with the US Federal Reserve having cut its key rate to 4.5% earlier this year, the yield differential that previously favored the dollar is steadily shrinking. This narrowing gap has historically put downward pressure on the USD/JPY pair.
Given these opposing forces, we see an opportunity in options strategies that profit from a large price swing, regardless of direction. Buying straddles or strangles on USD/JPY could be a prudent way to trade the expected spike in volatility once the size of the stimulus is announced. Traders should prepare for a sharp move rather than a slow drift.
We must also consider the Yen’s role as a safe haven, especially with persistent global growth concerns. Any unexpected shock to the global markets, like the supply chain disruptions we saw in early 2025, could trigger a flight to safety. This would cause a rapid and sharp strengthening of the Yen, catching many off guard.
