Joint US-Japan yen intervention sheds half its gains within two weeks
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Japan's finance ministry sold as much as $59 billion on July 30 to support the yen, and U.S. Treasury Secretary Scott Bessent and Japan's Finance Minister Satsuki Katayama confirmed the first joint intervention since 1998. The yen strengthened from 163 to 157 per dollar but had slipped back to 159 by Aug. 11, erasing half of the intervention's gains. Economists say the step did not address the underlying interest-rate gap and fiscal concerns driving the currency's weakness.
The July 30 Intervention
Japan's finance ministry sold as much as $59 billion to buy yen on July 30, according to Bank of Japan data, pushing the currency from 163 to 157 per dollar. U.S. Treasury Secretary Scott Bessent and Japan's Finance Minister Satsuki Katayama confirmed the first joint intervention since 1998 and pledged to act again if needed. By Aug. 11 the yen had retreated to 159, surrendering half of its post-intervention gain. Reuters reported that U.S. and Japanese officials discussed the joint action as early as January, with talks intensifying after Bessent's May visit to Tokyo.
Structural Weakness Drivers
Economists attribute the yen's slide since 2012 to the wide U.S.-Japan interest-rate gap, concern about Japan's fiscal position, and higher yields available elsewhere. Mitsubishi Electric CFO Kenichiro Fujimoto told Reuters last week that a weak yen 'does not necessarily mean all is well,' citing rising import costs and cost-of-living pressure. The yen traded around 78 to the dollar in 2012 and began 2026 at 156 before sliding to 163 by late July. Corporate Japan, once reliant on a weak currency for export competitiveness, now faces profit and consumer-price strains as food and energy costs climb.
Treasury Market Constraint
According to Reuters, traders reported that the U.S. sold euros rather than dollars to fund its yen purchases, aiming to limit disruption to an already pressured U.S. Treasury market. Julius Baer economist David Meier wrote Monday that U.S. involvement likely served to maintain stable Treasury yields by limiting pressure from Japanese sales. Japan is the largest foreign holder of U.S. Treasuries at $1.2 trillion; any sale by Tokyo to fund intervention would add stress to the bond market. A photograph of Bessent's notepad from a cabinet meeting read 'Buy Japanese Yen (JPY) $5-10 bil.'
What's Next
Officials from Tokyo and Washington have pledged to repeat the intervention if needed, though no date for another joint action has been set. It remains unclear whether further dollar-selling can reverse the yen's slide while the U.S.-Japan interest-rate gap and Japan's fiscal concerns persist.
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Joint US-Japan yen intervention sheds half its gains within two weeks
