The yen is currently trading around 159 per US dollar, nearing the critical psychological threshold of 160. Despite an unprecedented joint market intervention by the United States and Japan, including commitments to further action, the yen's downward trajectory has not reversed.
Less than two weeks after the historic coordinated intervention, the yen has already given back about half of the gains it initially made. Multiple fundamental factors continue to weigh on the yen, pushing it to multi-decade lows, and short-term intervention measures are struggling to counter these forces. The yen briefly fell past 163, strengthened to around 155 after the intervention, and has now slipped back above 159 per US dollar.
Jesper Koll, an expert director at Monex Group, stated: "Intervention can shock the market, but it cannot change the fundamental laws of finance—capital flows to where returns are highest. As long as the cost of capital in Japan remains lower than overseas yields, carry trades will make a comeback."
The core issue lies in the yield gap between the US and Japan. Japan's borrowing costs are far lower than those in the US and other markets, prompting investors to borrow yen cheaply and invest in higher-yielding assets—a classic carry trade. The current external environment has worsened: US Treasury yields are rising, oil prices are elevated (Japan is highly dependent on energy imports, which is a significant blow), and multiple macro factors are again favoring the US dollar. Koll believes that while the intervention cannot eliminate the yield advantage supporting the dollar, it has successfully curbed excessive speculation and increased the risk for short-selling the yen. Shocking the market is easy; guiding the market requires changing incentives and rebuilding confidence.
Luyang Yan, a senior fixed-income and FX strategist at State Street Global Advisors, noted: "This intervention successfully reshaped market expectations and demonstrated a rare high level of policy coordination between the US and Japan. However, it has not yet eliminated the yield advantage that supports the dollar." The yield gap remains stark: the US 10-year benchmark Treasury yield stands at 4.686%, while Japan's 10-year government bond yield is only 2.846%, a huge spread that continues to attract investors to hold US bonds. Yan added, "Think of it this way: the intervention effectively slowed down speculative momentum but did not reverse the fundamental landscape."
Market attention is now focused on the Bank of Japan, with its next monetary policy meeting scheduled for September. Monex Group's Koll suggested that more than the intervention itself, investors are surprised by the BOJ's reluctance to tighten monetary policy more aggressively. This raises speculation: is the central bank constrained by concerns over banking stability and Japan's massive public debt? If Japan does not raise rates and US yields do not fall, capital will still have the incentive to flow overseas.
John Wood, Chief Investment Officer for Asia-Pacific at Lombard Odier, believes the impact of this round of intervention is likely "short-lived and limited." He argues that the BOJ needs at least two more rate hikes to have a chance to stem the yen's weakness.
Multiple headwinds for the yen
But interest rates are only part of the story. Crédit Agricole points out that a deeper contradiction lies in the imbalance in investment strength between the two countries. The US continues to invest heavily in areas like artificial intelligence, constantly attracting global capital inflows, while the public-private investment plan proposed by Prime Minister Shigeru Ishiba has not yet been fully implemented. The bank's view: to reverse the yen's weakness, simply raising interest rates is far from enough; the core is to expand the scale of investment. This means that for the yen to stabilize and recover sustainably, Japan must ultimately enhance the attractiveness of its domestic assets, guiding domestic savings to stay at home rather than seeking returns overseas.
For now, the intervention seems more like a "guardrail" to prevent the yen from accelerating its collapse, rather than a tool to completely reverse the downtrend. State Street's Yan stated that the 160 level has become a policy red line. If the currency rapidly breaks through that level again, regulatory officials may step in with another intervention. "The possibility of another intervention cannot be ruled out, especially if the exchange rate moves in a rapid, disorderly fashion. But in the end, intervention can only buy time; the real task of solving the problem falls on the BOJ's policy normalization process, which could see a key move as early as September."
The US and Japan are also trying to strengthen their deterrent capability, notably referencing the Federal Reserve's repo facility for foreign monetary authorities. This mechanism allows countries to use US Treasuries as collateral to obtain dollar liquidity, reducing Japan's need to sell US bonds to raise funds for intervention. US Treasury Secretary Scott Bessent has signaled support for expanding this backstop facility. This arrangement increases the cost of persistently shorting the yen, but it cannot eliminate the carry trade from its root cause. Koll concluded: "Shocking the market is easy, but to guide the market, you must reshape yield incentives and rebuild trust."
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