US, Japan intervene jointly to lift yen from 40-year low

Japan and the United States carried out a coordinated intervention last week to support the yen after it reached a 40-year low near 164 to the dollar. Tokyo's finance ministry confirmed the action on Monday, marking the first such joint effort since 2011. The yen strengthened to around 155 to the dollar, its strongest level in three months.

US Treasury Secretary Scott Bessent indicated that Washington stands ready for additional steps if needed. A photograph from a cabinet meeting showed notes outlining plans to purchase between 5 billion and 10 billion dollars worth of yen. Bank of Japan records suggest Tokyo sold nearly 59 billion dollars in New York trading to acquire yen ahead of the joint move.

The yen's prolonged weakness stems from Japan's persistently low interest rates compared with those in the United States and other major economies. This gap encouraged investors to borrow in yen for higher-yielding assets elsewhere, a strategy known as the carry trade. Recent Japanese fiscal plans involving tax cuts and increased spending under Prime Minister Sanae Takaichi have added pressure by raising government borrowing costs and drawing criticism toward Bank of Japan rate decisions.

President Donald Trump described the support as assistance requested by Japan. Analysts note that such interventions can create short-term caution among speculators but rarely overcome deeper policy differences. UBS strategists pointed out that Japan's gradual policy adjustments and negative real interest rates leave the currency more reliant on the threat of further action than on market fundamentals.

HSBC economists emphasized that sustained yen strength would require faster Bank of Japan rate increases and shifts in government approach. Without those changes, repeated buying of yen risks draining reserves while leaving the same incentives for capital flows intact. Past efforts in 2022 and 2024 followed similar patterns and produced only temporary relief.

Market reactions on Monday showed modest dollar movement, with attention turning to unresolved questions over Federal Reserve policy. Broader trading reflected investor focus on earnings reports and potential consolidation in sectors such as healthcare. Oil prices declined amid easing tensions involving Iran, while equity futures pointed higher.

The episode underscores how central bank and fiscal choices shape currency values more than occasional official purchases. Coordinated interventions can influence sentiment for a time, yet they leave the underlying rate and spending disparities untouched.