One month after the joint US-Japan intervention to strengthen the yen, the currency has lost approximately half of its initial gains, underscoring the challenges of government-backed support against fundamental economic pressures. The coordinated effort on July 31 initially lifted the yen from above 163 to the dollar to as high as 155. However, it has since weakened to around 159.06 per dollar, marking a significant reversal.
The intervention, a rare joint effort by the US Treasury and the Bank of Japan, aimed to stabilize the embattled yen. While it temporarily squeezed out short yen positions, analysts like Daleep Singh, chief global economist at PGIM, expressed skepticism about its long-term effectiveness, suggesting it might even backfire. He noted that speculators could aggressively sell yen and Treasurys to force precautionary rate hikes from the Bank of Japan (BoJ) and the Federal Reserve.
The primary driver behind the yen's continued weakness is the substantial interest rate differential between Japan and the United States. With US Treasury yields significantly higher than Japanese government bond yields (e.g., US 10-year Treasury at nearly 4.7% versus Japan's 10-year at under 2.9%), investors are incentivized to engage in carry trades: borrowing in low-interest yen to invest in higher-yielding dollar assets. This fundamental imbalance cannot be altered by intervention alone, as acknowledged by Treasury Secretary Scott Bessent, who stated that "policy that turns it" not intervention.
The initial intervention bought time and reset market positioning but did not address the underlying economic disparities. Market observers are now focusing on potential policy changes from the BoJ, particularly meaningful rate increases, as the more effective solution to strengthen the yen. Such a move, however, would be complex given Japan's significant bond-market exposure. The continued weakening of the yen also benefits the US by creating demand for US government debt as capital flows into higher-yielding dollar assets.
