The yen has fallen to an 8-month low. Will Japan intervene? The new finance minister warns: Closely monitoring with a strong sense of urgency.

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As the yen/dollar exchange rate fell to an eight-month low, Japan’s verbal intervention in the foreign exchange market is intensifying.

Japan’s new Finance Minister, Kaori Katayama, issued her most explicit warning since taking office on Friday, stating that Japan is watching the yen’s exchange rate with “a high sense of urgency.” This suggests that her tolerance for the currency’s sustained depreciation is waning, quickly raising market expectations for direct government intervention.

Katayama told reporters on Friday: “Recently, we’ve seen very one-sided and rapid currency fluctuations.” She emphasized that the government is closely monitoring “excessive or disorderly movements in the foreign exchange market driven by speculative activity” with a high sense of urgency.

Katayama made these remarks following a sharp decline in the yen’s exchange rate. On Thursday, the Bank of Japan decided to keep its benchmark rate unchanged, disappointing investors hoping for a policy shift; the yen fell to 154.17 against the dollar, an eight-month low. After Katayama issued her warning, the yen rebounded slightly to 153.65.

New Finance Minister Takes a "Tougher" Stance

The phrase “high sense of urgency” used by Katayama this time is tougher than the language used by her predecessor when the yen hit the 153 level in mid-October, indicating increased official concern.

However, Katayama also stated that it was very reasonable for the Bank of Japan to keep its policy unchanged, triggering different interpretations in the market.

According to the latest Nomura Securities research report, market participants may interpret this as the Finance Ministry’s concern over exchange rate volatility “not being particularly strong,” since she simultaneously expressed support for the monetary policy that led to the yen’s weakness. This ambiguity makes traders more cautious when assessing the risk of intervention.

The report also emphasized, however, that Katayama’s remarks may be “out of respect for the Bank of Japan.”

Are Intervention Conditions Taking Shape?

Despite the ambiguity in official statements, several indicators suggest that the conditions for foreign exchange intervention may be forming. According to Bloomberg analyst Skylar Montgomery Koning, two key factors for Japan to take more decisive action are the “speed and level” of depreciation.

Historically, Japanese authorities intervened in October 2022 when the yen depreciated by about 14% to the 155 level in three months; in May 2024, they entered the market again when the yen lost 8% in less than two months and broke above 160. In comparison, the roughly 5% drop in the past month is already enough to trigger “concern.”

Moreover, 155 is seen by the market as an important psychological threshold. Analysts believe the current weakness of the yen has become a political burden, as it exacerbates imported inflation and pressures living costs. These factors jointly constitute the mature conditions for intervention.

Historical Lessons: Intervention May Have Limited Effect

However, historical experience shows that even if Japan takes practical action, the long-term effect is questionable.

Nomura’s report reviewed the situation in 1997–1998, when Japan’s Finance Ministry carried out several yen-buying interventions, including joint intervention with the U.S. History shows these measures failed to fully stop the yen’s depreciation trend.

In retrospect, it was external financial shocks such as the Russian debt crisis that ultimately caused a surge in market risk aversion, which pushed the USD/JPY rate down sharply at the end of 1998.

The lesson from history is that intervention may work in the short term but usually cannot reverse long-term exchange rate trends driven by fundamentals (such as interest rate differentials). Unless there are significant changes in the external macroeconomic environment, intervention alone is unlikely to sustain the yen.

Looking ahead, the market’s focus will be on U.S. economic data and Japan’s upcoming budget talks starting November 7, both of which may provide new guidance for the yen’s movement.

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