Japan deployed record-breaking funds to intervene in the foreign exchange market over the past month, a move that not only set historical benchmarks but also boosted its deterrence power through rare support from the United States, signaling a strong stance against bearish positions on the yen.
According to data released by Japan's Ministry of Finance on Friday, the government utilized a total of 15.4 trillion yen (approximately $96.4 billion) for market intervention between July 30 and August 26, marking the largest monthly intervention on record. This action came after the yen weakened to its lowest point in four decades, nearing the threshold of 164 yen per dollar. Japanese Finance Minister Katsunobu Kato and U.S. Treasury Secretary Scott Bessent confirmed in early August that coordinated intervention had been executed on July 31, with both officials stating their readiness to re-enter the market without hesitation if necessary.
Following the announcement of the joint intervention, the yen surged to 155.23 per dollar, a significant rebound from pre-intervention levels. By Friday evening in Tokyo, the yen was trading at 159.68 per dollar, having given back more than half of its gains. However, the currency has not approached the 160 mark for roughly four consecutive weeks, indicating that market participants remain cautious about potential further official actions.
Record intervention scale underscores persistent yen pressure
The unprecedented size of this intervention reflects the urgency felt by Japanese authorities in dealing with sustained depreciation pressure on the yen. According to an analysis of Bank of Japan data by Bloomberg, authorities deployed approximately 8.45 trillion yen on July 30, followed by another 5.3 trillion yen the next day, with further sharp yen movements observed on August 1.
Rinto Maruyama, senior rates and FX strategist at SMBC Nikko Securities, noted, "This is a massive figure. Authorities have now spent 27 trillion yen on intervention this year, yet USD/JPY remains hovering below 160, demonstrating that the underlying pressure for yen weakness remains quite strong."
Interestingly, this intervention featured tactical innovation. Authorities chose to act one day before the Bank of Japan's policy decision, breaking from the previous pattern where interventions were typically implemented after central bank meetings or major economic data releases. This strategy was designed to catch speculators off guard.
First coordinated U.S.-Japan intervention in 28 years
The most notable aspect of this intervention is American participation. On July 31, Tokyo and Washington acted jointly in the market, marking the first coordinated effort to support the yen since 1998. The U.S. contribution was not included in Japan's Ministry of Finance data and is expected to be relatively limited in size, though its symbolic significance far outweighs the actual funds deployed.
During the intervention period, Bessent was photographed with a notebook listing a to-do item involving the purchase of up to $10 billion in yen. This compares to U.S. participation in interventions in 1998 and 2011, which involved amounts close to $1 billion each. After the operation concluded, Bessent posted on X, expressing strong support for Japan's decisive market and currency measures to correct what he described as the yen's severely undervalued state.
Both parties also indicated that future currency interventions could utilize the Federal Reserve's Foreign and International Monetary Authorities (FIMA) Repo Facility, effectively addressing market concerns about limited ammunition. Previously, some market participants believed that intervention capacity was constrained due to Bessent's opposition to Japan selling U.S. Treasuries.
Maruyama added, "Once the U.S. becomes involved, the market perceives that intervention funds are essentially unlimited. I believe this coordinated intervention has already proven quite effective."
Market outlook: BOJ rate hike expectations rise, U.S. policy becomes pivotal
The joint intervention and Bessent's public statements have fueled expectations in the market for a Bank of Japan rate hike in September, which would provide further support for the yen should it materialize.
Keiichi Iguchi, senior strategist at Mizuho Holdings, commented, "Against the backdrop of potential intervention concerns, the previously strong dollar-buying demand targeting the 160 yen level has clearly subsided." He added that factors favoring dollar weakness are accumulating, though a trend reversal remains some distance away. "If at some point the market reacts to the Bank of Japan's hawkish stance, the strong dollar, weak yen dynamic could see a reversal."
Maruyama emphasized that U.S. policy direction is equally critical. "The key moving forward will be how the market assesses whether the U.S. will actually raise rates, based on Warsh's speech at Jackson Hole tonight and next week's employment report. This will have a significant impact on yen movements."
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