Key Summary

The yen's break below 160 (USD/JPY above 160) for the first time since the record joint intervention underscores how limited the impact of that $98.7 billion spending effort has been against the pull of widening rate differentials, and reinforces that verbal or coordinated FX intervention alone struggles to offset a genuine shift in relative monetary policy expectations. The accompanying rise in the 10-year JGB yield to a fresh 30-year high of 2.95 percent, tracking the move in US Treasury yields following Warsh's remarks, adds a second channel of pressure, since higher Japanese long-term yields raise the risk of spillover into global bond markets given Japan's role as a major holder of foreign assets. Bessent's description of the yen's moves as well contained, paired with his continued deference to Governor Ueda on the pace of BOJ hikes, suggests Washington is for now content to let Tokyo manage its own policy response rather than push for fresh intervention, which could mean further yen weakness persists until the BOJ itself signals a shift. The prospect that G20 talks could see Bessent press Japan on fiscal discipline and further rate hikes in exchange for coordinated support adds a diplomatic dimension that currency traders will need to watch closely in the days ahead. --- Earlier: Japan factory output tops forecasts as retail sales rebound sharply --- The yen's slide past 160 shows how little Japan's record intervention has done to offset the pull of a more hawkish Fed. Summary: The Wall Street Journal reports Japan spent a record $98.7 billion in joint action with the US over the past month to support the yen, with limited success in reversing its downtrend. The yen weakened to 160.20 against the dollar on Friday after Fed Chair Kevin Warsh signaled openness to raising rates, the first breach of 160 since the historic joint intervention. Warsh's Jackson Hole remarks on needing confidence that underlying inflation is moving toward target at sufficient speed lifted Treasury yields and the dollar. The 10-year Japanese government bond yield rose to a fresh 30-year high of 2.95% on Monday, tracking the move in US yields, with the dollar last trading at 159.85 yen. Treasury Secretary Scott Bessent described the yen's moves as pretty well contained and said he expects BOJ Governor Kazuo Ueda to do the right thing on policy with Prime Minister Takaichi's backing. Nomura Research Institute's Takahide Kiuchi says Bessent may use the upcoming G20 gathering to press Japan on fiscal discipline and further BOJ rate hikes in exchange for coordinated intervention support. The yen weakened past the closely watched 160 level against the dollar for the first time since the record joint Japan-US intervention last month, according to the Wall Street Journal, as renewed expectations of Federal Reserve tightening dimmed hopes that US-Japan interest rate differentials would narrow in the currency's favour. The move came after Fed Chairman Kevin Warsh signaled openness to raising rates at the Jackson Hole economic symposium, telling attendees the Fed must be confident that underlying inflation is moving toward its objective clearly and at sufficient speed, or there remains work to do. The Journal reports that Japan spent a record $98.7 billion in coordinated action with the US over the past month in an effort to prop up the yen, an intervention that has had only limited success in reversing the currency's broader downtrend. Friday's slide to 160.20 per dollar marked the first time the yen had breached that level since the intervention was carried out, underscoring how quickly the currency's earlier stabilisation has begun to unwind. Warsh's comments also rippled through fixed income markets, lifting Treasury yields and the dollar and pulling Japanese government bond yields higher in turn. The 10-year JGB yield rose to a fresh 30-year high of 2.95 percent on Monday, tracking the move in US yields, while the dollar was last trading at 159.85 yen. Despite the renewed pressure, US Treasury Secretary Scott Bessent told Reuters the yen's moves remain pretty well contained, and said he expects Bank of Japan Governor Kazuo Ueda to do the right thing on monetary policy with the backing of Prime Minister Sanae Takaichi, according to the Journal. That echoes previous comments from Bessent expressing confidence in Ueda's approach, remarks market participants have interpreted as an implicit endorsement of further Japanese rate hikes. Nomura Research Institute's Takahide Kiuchi, a former Bank of Japan policy board member, told the Journal that Bessent may use the upcoming Group of 20 finance ministers' gathering to press Japan to maintain fiscal discipline and pursue further BOJ rate increases in exchange for continued coordinated intervention support. Kiuchi said curbing yen weakness would help correct broader dollar strength and reduce the US trade deficit, while also noting that rising Japanese long-term yields tied to yen depreciation risk spilling over into US markets, making yen containment a shared interest for both countries. This article was written by Eamonn Sheridan at investinglive.com.