The Japanese yen has erased about half of its gains following a historic U.S.-Japan currency intervention less than two weeks ago, as the underlying economic forces that pushed the currency to multi-decade lows continue to outweigh short-term market measures.
The yen is currently trading above 159 per U.S. dollar, after strengthening to around 155 following the intervention that took place after the currency weakened beyond 163 per dollar.
“Intervention has scared markets, but has not stopped the laws of finance which say money flows in the direction of maximum returns,” said Jesper Koll, expert director at Monex Group. He added that as long as borrowing costs in Japan remain below returns available overseas, yen carry trades are likely to return.
Japan-U.S. yield gap keeps pressure on yen
The main challenge for the yen remains the significant gap between Japanese and U.S. interest rates. With borrowing costs in Japan still much lower than in the United States and other major markets, investors continue to borrow yen cheaply and invest in higher-yielding assets.
The environment has become more challenging as higher U.S. Treasury yields and elevated oil prices strengthen the factors supporting the dollar. Rising energy costs are particularly problematic for Japan, which relies heavily on imports.
Analysts noted that the intervention helped reduce excessive speculative positions against the yen and increased risks for traders betting on further weakness. However, it has not removed the underlying yield advantage that continues to support the U.S. dollar.
“The intervention successfully reset market psychology and demonstrated an unusually strong degree of U.S.-Japan policy coordination. What it has not yet done is eliminate the yield advantage supporting the dollar,” said Masahiko Loo, senior fixed income and currency strategist at State Street Global Advisors.
The yield difference remains significant, with the benchmark 10-year U.S. Treasury yield at 4.686%, compared with 2.846% for 10-year Japanese government bonds. This continues to provide investors with incentives to hold U.S. assets.
Bank of Japan policy remains key
Attention is now focused on the Bank of Japan and its next monetary policy meeting scheduled for September. Analysts believe further rate increases may be necessary to provide lasting support for the currency.
Jesper Koll said the bigger concern for investors was not the intervention itself, but the Bank of Japan’s reluctance to tighten policy more aggressively. This has raised questions over whether concerns about Japan’s banking system or public debt levels are limiting policymakers’ options.
John Wood, chief investment officer for Asia at Lombard Odier, said the latest intervention would likely have only a temporary impact and suggested the BOJ may need at least two additional rate hikes to slow the yen’s decline.
Weak yen requires stronger investment appeal
However, interest rates may not be the only factor influencing the yen’s weakness. Crédit Agricole CIB said Japan faces a broader challenge due to an “asymmetry of investment power” between the two economies.
Strong investment flows into the United States, particularly in areas such as artificial intelligence infrastructure, continue to attract global capital. Meanwhile, Japan’s planned public-private investment initiatives have yet to fully develop.
According to Crédit Agricole CIB, a sustainable recovery for the yen requires Japan to make domestic assets more attractive so that savings remain within the country rather than flowing overseas.
For now, intervention appears more likely to act as a safeguard against further rapid yen depreciation rather than a complete reversal of the currency’s decline.
Analysts said the 160 yen per dollar level has become an important political threshold, meaning another sharp move beyond that point could trigger renewed government action.
“I would not rule out another intervention, particularly if the move becomes rapid or disorderly,” said State Street’s Loo. However, he added that intervention can only provide temporary relief, with long-term improvement depending on further Bank of Japan policy normalization.
