The United States and Japan jointly intervened in currency markets to buy yen for the first time in nearly three decades, a move aimed at stemming the yen's slide to a 40-year low against the dollar. Japanese Finance Minister Satsuki Katayama confirmed the operation on Monday and warned that further joint interventions could occur if necessary.
Following the intervention, the Japanese yen traded around 156.5 per dollar, a significant strengthening from levels above 163 before the action. However, the stronger yen weighed on Japanese exporters, with the Nikkei 225 index falling as much as 2.5%.
The coordinated intervention has traders closely watching the yen-funded carry trade, a strategy where investors borrow in low-yielding currencies like the yen to invest in higher-yielding assets abroad. This focus echoes a similar market dynamic seen in the summer of 2024, when a Bank of Japan intervention, a surprise rate hike, and expectations of lower US interest rates triggered a sharp yen rally and unwound leveraged carry trades.
While the carry trade remains attractive due to the significant interest rate differential between the US and Japan, the joint intervention has altered the perceived risks for those betting against the yen. Analysts suggest the intervention has "profoundly upped the ante on deterrence" for both speculative yen bears and carry traders. Unlike previous interventions, this action has not been accompanied by a major shift in expectations for US or Japanese interest rates, meaning the fundamental rationale for the carry trade persists. Investors are now looking for further signals from the Bank of Japan, such as additional rate hikes, which would narrow the interest-rate gap and make borrowing yen more expensive.
Bank of America strategists anticipate the Bank of Japan may raise rates again in October, with a growing possibility of a September move. They noted that a sustained break below the 155 yen level could prompt investors to reconsider their bearish yen positions. MUFG's Michael Wan commented that while the joint intervention is significant and could help clear out short yen positions in the short term, a more durable decline in USD/JPY would likely require a change in fundamental factors, such as further rate hikes from the BOJ.
