The US dollar is heading for its worst week in three months, tumbling to its lowest level in over a month. This decline is fueled by a double blow: growing skepticism about the Federal Reserve's commitment to curbing inflation under its new leadership, and what appears to be a record-breaking yen-buying intervention by Japanese authorities.
The Bloomberg Dollar Spot Index has fallen as much as 1.2% this week, with a slight recovery on Friday driven by month-end flows failing to mask the overall weakness. At the heart of the dollar's slide is unease over the leadership of Fed Chair Kevin Warsh. His recent comments have sparked concerns that the central bank may hesitate to raise interest rates, even as inflation remains above target. This anxiety has been reflected in asset prices: long-term Treasury yields have climbed to their highest since 2007, a typical sign of rising inflation expectations. However, the dollar has weakened instead of strengthening alongside yields, an unusual disconnect. Randil Prakash, Managing Director at Gavekal Wealth, describes this as having a "bit of an 'emerging market' feel," noting that investors are beginning to express dissatisfaction with the US policy path, a development that is "bearish for both Treasuries and the dollar."
While Thursday's economic data provided a rationale for the Fed to hold steady—showing a slowdown in Q2 US growth and a 0.1% month-over-month decline in the Fed's preferred core PCE price index—it failed to dispel the cloud hanging over the dollar. As of Friday, the swaps market is still pricing in a total of 34 basis points of rate hikes for the remainder of the year, unchanged from Thursday. "We are still not in a hurry to call a bottom for this dollar sell-off," says Francesco Pesole, FX Strategist at ING. "Any data miss in the US could trigger a more aggressive dovish repricing than usual."
Japan's "Surprise" Attack: A $53 Billion Single-Day Intervention
As the dollar's own momentum waned, an apparently forceful intervention by Japanese authorities added another weight. During the New York trading session on Thursday, the yen surged 3.3% against the dollar in a matter of hours, marking its biggest one-day gain since December 2023. The yen touched a high of 158.34, moving sharply away from the 40-year low near 164 hit earlier in the week. The dollar recorded its largest single-day decline since late 2022. Although Japanese Ministry of Finance officials have declined to confirm the intervention, multiple pieces of evidence point to a carefully orchestrated operation. Based on changes in the Bank of Japan's accounts compared to broker forecasts, analysts estimate the intervention size to be around ¥8.45 trillion, or approximately $52.8 billion. This would likely be the largest single-day intervention on record for Japan. In a report to institutional clients, Citi's sales and trading desk noted that its electronic trading platform recorded about $8.1 billion in dollar-yen sell orders in just the ten minutes between 9:30 AM and 9:40 AM Eastern Time on Thursday.
"It's hard to imagine anything other than currency intervention causing the yen to collapse by 5 points in such a short time," says Daisuke Ueno, Chief FX Strategist at Mitsubishi UFJ Morgan Stanley Securities. He believes the authorities specifically chose to act between the Fed and Bank of Japan meetings to "catch the market off guard." Market sources also suggest that South Korean authorities were selling dollars during the New York session, sending the won to its strongest level since mid-October and fueling speculation of coordinated action. Japan's top currency official, Atsushi Mimura, hinted that the government's actions are gaining support from other countries, including the US. A person familiar with the matter revealed that US authorities conducted a "rate review" around 2:30 AM Tokyo time on Friday, a move often seen as a precursor or support for coordinated intervention.
Post-Intervention Focus: The Bank of Japan and the Dollar's Outlook
After the brief artificial lift, the yen's sustainability is now under scrutiny. On Friday, the Bank of Japan held its policy rate steady as expected, causing the yen to give back some of its overnight gains, trading near 160 at the time of writing. This marks Japan's second major intervention of the year. Earlier, during the Golden Week period from late April to early May, authorities spent a record ¥11.73 trillion in a single month on intervention, only to see the yen quickly retrace its gains. The real battle for the yen will likely be decided in the Bank of Japan's policy communication. If the market interprets the central bank's future rate hike pace as slower than expected, the yen's intervention-driven gains could evaporate quickly. "The key is whether the authorities will continue to push the dollar-yen pair below 155," says Hiroshi Saito, Executive Advisor at SBI FX Trade. "We want to use this to gauge the government's determination to defend the currency."
For the broader dollar outlook, as the market reassesses the Fed's policy path and becomes more sensitive to US economic data, any economic headwind could amplify volatility. With Japan having drawn a clear 'red line' with real money, the dollar may face increased dual pressure in the short term from both the policy front and overseas official actions.
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