Asian currencies rallied Wednesday as the Japanese yen staged a fourth consecutive session of gains, approaching its highest level in nearly seven months against the dollar. The yen climbed as much as 152.89 earlier in the week before settling at 153.63, down 0.2% — adding to a 4% advance in September alone.
The U.S. dollar index was little changed at 98.83, up just 0.1%, as investors absorbed fresh data on Treasury buyback activity and awaited key inflation readings from the euro zone and the United States later in the week.
"The yen's rally reflects a genuine fundamental and technical shift, with the Bank of Japan moving deeper down the path of policy normalization and trend breaking," said Adam Turnquist, chief technical strategist at LPL Financial. He warned that a decisive break below the 152 level could accelerate the yen's advance, force additional short covering and reignite unwind risk in the yen carry trade, with ripple effects across global assets including U.S. Treasuries.
Markets are pricing in a near-certainty that the BoJ will raise rates by 25 basis points on Sept. 18, the latest move in a series of policy normalizations that have pushed Japanese long-term yields upward. In an effort to manage supply, the U.S. Treasury Department announced Wednesday it would buy back up to $6 billion in 10- to 20-year maturities this month — an increase from the prior month's plan of at least $4 billion, though still well below the roughly $10 billion that media reports had suggested.
Benchmark U.S. 10-year yields climbed 3.5 basis points to 4.839% following the announcement, while the 2-year yield rose 2.7 basis points to 4.425%. Robin Brooks, a senior fellow at the Brookings Institution, cautioned that artificially capping long-term yields through buybacks carries risks. "The problem with trying to artificially cap long-term yields is that yields jump if markets think buybacks are too small," he said. "This tells you underlying upward pressure is intense."
Japan's own capital flows added another dimension to the yen's strength. Data showed the country's holdings of foreign securities fell by a record $87.8 billion in August, reflecting a significant shift in overseas portfolio positioning. Meanwhile, Tokyo's overall currency intervention operations have totaled 15 trillion yen ($97.67 billion) in recent years, though no new intervention was reported Wednesday.
The euro rose 0.1% to $1.1629 as traders weighed an upcoming European Central Bank rate decision on Thursday. Jim Reid of Deutsche Bank noted that energy price pressures have shaped market expectations for ECB policy. "The market obviously believes the ECB's reaction function is very heavily tied to energy, with recent increases in oil and gas prices prompting terminal market pricing of 3%," Reid said, suggesting a rate hike was all but assured but that the path beyond that point was far less clear given lingering uncertainty around growth.
Thursday's schedule also includes the U.S. August producer price index report, followed by consumer price data on Friday, both expected to keep the dollar under pressure if they confirm cooling inflation.
