The yen has become a release valve. That is Bipan Rai's assessment, and the implications extend well beyond Japan. In Episode 42 (August 4, 2026) of BMO ETFs' Open Outcry Podcast1, the Managing Director and Head of ETF and Alternatives Strategy at BMO Global Asset Management takes the solo chair to walk through a macro environment that has, in the span of a few weeks, delivered elevated U.S. Treasury yields, unusually resilient business sentiment, record S&P 500 earnings beats, and the first coordinated U.S.-Japan currency intervention in fifteen years. The thread connecting all of it is more consequential than it might first appear.
The Long End Is Speaking
Thirty-year U.S. Treasuries are probing above 520 basis points, levels not seen in several decades. Rai traces this to two forces: a repricing of R-star in light of AI-driven productivity gains, which has pushed real rates higher, and a marked increase in the term premium over the past week. The latter, he argues, reflects genuine credibility risk beginning to surface around the Fed. Following the most recent FOMC decision, in which Chair Warsh left markets without a coherent rationale for staying on hold, long-end yields rose sharply. The concern is clear: if the Fed repeatedly cites rising long-end yields as a substitute for rate hikes, the long end will eventually call that bluff. "If they repeatedly cite the move higher in long-end yields as a substitute for policy tightening," Rai says, "then investors may question whether there's a commitment to raise rates at all." Dollar OIS markets currently price just over 16 basis points for September, making a hike better than even odds. Whether the FOMC can communicate its way out of the term premium problem remains to be seen.
Fundamentals Refuse to Break
Against this backdrop of yield curve anxiety, the real economy data has been unusually firm. ISM Manufacturing is at its strongest since June 2022, with new orders and the employment subindex both expanding. PMIs across major developed and select emerging markets remain above 50. And on the corporate side, nearly 90% of S&P 500 companies that have reported have beaten estimates, well above the historical average of 75 to 76%. Revenue and sales surprises have been similarly strong. "This doesn't really come down to cost cutting, improving profit margins," Rai notes. "This is really a strong fundamental signal that's being sent to us by the U.S. economy." Forward earnings growth expectations now sit around 27%. Financials, industrials, defense, energy, and AI-related names have all contributed. The policy rates, Rai concludes, simply are not as restrictive as many have assumed. That makes the next Fed move more likely a hike than a cut.
Why the U.S. Stepped In for the Yen
The episode's central focus is the coordinated intervention on July 31st, when the U.S. Treasury joined Japan's Ministry of Finance to support the Japanese yen for the first time in fifteen years. Dollar-yen had moved toward 164, the weakest level for the currency in over four decades. Japan purchased roughly $50 to $60 billion worth of yen. The U.S. Treasury, notably, sold euros rather than dollars to buy yen through the Federal Reserve Bank of New York. The choice of euros, Rai observes, was deliberate: selling dollars directly could have sent the wrong signal to markets and risked pushing Treasury yields even higher. The intervention pulled dollar-yen back to around 157.50, a move of roughly 3.5% from Thursday's close.
The structural case for why the yen has been weakening is not difficult to make. The Bank of Japan has been raising rates, but too slowly for market comfort given that Japan's gross government debt sits well above 200% of GDP. A faster-moving BOJ would increase the government's interest outlays, reinforcing the deficit problem. So the yen has absorbed the pressure instead. With Japan as the single largest country holder of U.S. Treasuries, Tokyo's need to fund unilateral yen purchases through Treasury sales would push U.S. yields higher at exactly the wrong time. "Treasury Secretary Bessent is well aware of and likely chose to get ahead of," Rai says, "any sort of untoward moves when it comes to U.S. Treasury yields." The intervention is as much a U.S. Treasury yield management exercise as it is a currency defence.
What It Won't Fix
Rai is direct about the limits of the operation. The U.S. Exchange Stabilization Fund holds only $40 to $50 billion in foreign currency reserves. China holds $3.4 trillion. Switzerland holds roughly $930 billion. India, close to $570 billion. "In the context of foreign currency reserves," Rai says, "$40 to $50 billion is incredibly small." The signal effect has worked for now. But the day-to-day flow in dollar-yen runs to hundreds of billions, and unilateral intervention by Japan has historically underperformed coordinated multilateral efforts. Any broader Plaza Accord analogy, without the participation of large FX reserve holders, strikes Rai as "an incredibly unlikely parallel."
FX Hedging Is No Longer Optional Thinking
The most durable portfolio implication from this episode is not about the yen specifically. It is about what a more activist FX regime means for how advisors and investors manage foreign currency exposure. "The most important thing this could herald," Rai says, "is the reintroduction of a more activist FX market where we do see governments get more involved with the valuations of their currency relative to other currencies." In that world, FX volatility is not an incidental drag but an intentional risk factor. Rai's framework is twofold: understand your view on the underlying currency, and understand how that currency pair behaves relative to the underlying asset. For U.S. equities, where the inverse relationship between equities and the dollar tends to dampen overall volatility, leaving exposure unhedged may be the appropriate default. For EAFE baskets, where Japan can represent upward of 20% of exposure, the hedging decision demands active engagement. Canadian listeners with U.S. Treasury holdings face the same calculus. "Foreign exchange is not a source of alpha," Rai concludes, "but really a risk mitigation tool."
5 Key Takeaways for Advisors and Investors
1. Elevated long-end yields are a policy communication problem as much as an economic one. The Fed's reluctance to clearly justify its hold decision has introduced term premium risk. Portfolios with significant duration exposure should account for the possibility that 30-year yields remain structurally elevated.
2. Business fundamentals are stronger than the macro narrative suggests. With ISM Manufacturing at cycle highs, PMIs broadly above 50, and S&P 500 earnings beat rates near 90%, the case for remaining constructive on risk assets has not deteriorated, despite the stutter-step in equity indices.
3. The U.S.-Japan intervention is a Treasury yield story as much as a yen story. Washington's participation reflects concern about Japan potentially selling Treasuries to fund yen support. Advisors holding U.S. fixed income should monitor the feedback loop between Japanese FX policy and long-end yields.
4. FX hedging decisions require active, ongoing judgment. The era of setting a hedge ratio and leaving it is under pressure. The relationship between each currency pair and its underlying asset class should guide hedging decisions, not habit or default.
5. Japan represents a concentrated, often underappreciated FX risk within EAFE allocations. With Japan commonly exceeding 20% weight in EAFE baskets, advisors should revisit whether existing hedging structures adequately reflect the current degree of yen volatility and the possibility of further intervention-driven swings.
Footnote:
1 Rai, Bipan. "Why the U.S. Intervened in the Yen's Historic Slump." Open Outcry Podcast, episode 42, BMO Global Asset Management, 4 August 2026, https://www.bmoetfs.ca/articles/the-open-outcry-podcast-why-the-us-intervened-in-the-yens-historic-slump-august-4-2026.
