A coordinated intervention by the U.S. and Japan in the foreign exchange market has provided the yen with a brief reprieve, but the true motives behind this rescue operation may extend beyond simply stabilizing the currency.
Multiple analysts point out that the timing of this intervention closely aligns with the U.S. midterm election calendar. On August 6, former Wall Street fund manager and macro analyst Ed Dowd wrote that the core logic of the intervention is to postpone the risk of a sharp rise in U.S. Treasury yields until after the midterm elections, maintaining market stability during a politically sensitive period, which serves the immediate interests of the ruling party.
This suggests that a significant portion of the support for the intervention stems from short-term political considerations rather than long-term economic logic. The question then arises: once the midterm elections are over and this political driver disappears, can the yen hold its ground?
Intervention Effectiveness: Short-Term Success, Long-Term Doubts
The intervention has achieved immediate results in the market. The yen rebounded from a low of 163.65 to around 159.09, marking its largest single-week gain since February.
U.S. Treasury Secretary Scott Bessent confirmed the coordinated action on August 2, stating that the U.S. "would not hesitate to participate in further joint interventions."
However, market participants largely view this as a temporary fix rather than a permanent solution. Historical evidence shows that official foreign exchange interventions, without supporting fundamental policies, often lack lasting effects. Each round of intervention requires increasing scale, yet the marginal benefits diminish. Dowd warned in his Substack column: "Officials can signal and keep buying for a while, but without sustained policy follow-through from Japan, the yen will eventually weaken again, forcing authorities into larger and more frequent interventions. Each round of intervention raises the risk of asset volatility and liquidity events that authorities are trying to avoid."
The Real Purpose of the Intervention: Protecting Treasuries, Not the Yen
To understand the deeper logic of this action, one must consider Japan's role. Japan is one of the largest foreign holders of U.S. Treasuries, with holdings exceeding $1 trillion. When the yen depreciates sharply, Japanese authorities face pressure to use foreign reserves and sell Treasuries to defend the currency, which would directly push up U.S. bond yields. Given the current high U.S. fiscal deficit, a sudden spike in yields is particularly problematic.
In other words, the immediate trigger for this intervention is the risk of Treasury sell-offs caused by the yen's weakness, not the yen itself. Bessent, citing the lessons of the Asian financial crisis in an interview with Steve Bannon, described the action as a preventive measure to "nip a crisis in the bud before it spreads." He said, "One of the triggers of the Asian financial crisis was the extreme weakness of the yen, which created a tsunami that swept through Thailand, Indonesia, and Malaysia. The emergency is to prevent an emergency. We don't have to wait for a crisis to erupt; we can resolve it in advance."
Notably, Reuters reported that the U.S. Treasury, through the New York Fed, issued notices to multiple banks before the intervention, instructing them to "be ready for subsequent actions." This rare advance notification highlights the high degree of political coordination behind the operation.
FIMA Expansion: A Hidden Yield Curve Management Tool
Another key aspect of this intervention is Bessent's explicit support for expanding the FIMA (Foreign and International Monetary Authorities) Repo Facility. This mechanism allows foreign central banks, such as Japan's, to use their holdings of U.S. Treasuries as collateral to borrow U.S. dollar liquidity from the Federal Reserve, without having to sell Treasuries directly into the open market.
Analysts point out that this arrangement effectively serves as a low-key yield curve management tool. By allowing Japan to exchange Treasuries for dollars rather than selling them outright, authorities can suppress upward pressure on Treasury yields without the Fed needing to publicly announce a new round of quantitative easing. This "stealth" operation is more politically palatable, but its essence is no different from yield curve control.
Carry Trade: The Sword of Damocles Hanging Over the Market
The intervention also introduces another significant risk. The yen carry trade is one of the most important structural risks in the current global financial market. For a long time, low-yielding yen has been used for financing, with investors borrowing yen to buy higher-yielding currency assets, creating massive carry positions. A rapid appreciation of the yen could sharply increase the financing costs of these positions, potentially triggering a wave of forced liquidations that could impact global stocks, bonds, and other risk assets.
August 2024 provides a recent reference point. At that time, the yen appreciated by about 10% in a short period, leading to severe volatility in Japanese stocks and global risk assets. The current intervention has driven the yen up by about 5%, and the market has so far reacted relatively calmly, but the subsequent trend requires close vigilance. Dowd described the authorities' dilemma as a "Catch-22": "They don't want the yen to keep depreciating, forcing Japan to sell Treasuries, but they also don't want the yen to appreciate too fast, triggering a cascade of carry trade unwinds. The chefs are busy in the kitchen; this is a dish that needs to be carefully prepared."
Structural Issues Remain: The Real Test Comes After the Midterms
The most fundamental limitation of this intervention is that it does not address any of the structural reasons for the yen's weakness. Japan has maintained an ultra-loose monetary policy for a long time, creating a significant interest rate gap with the Federal Reserve. This gap is the core driver of the yen's persistent depreciation. Meanwhile, Japan's public debt-to-GDP ratio is among the highest in the world, severely limiting its fiscal space and constraining the Bank of Japan's path to policy normalization.
If the Bank of Japan cannot sustain interest rate hikes and fiscal discipline does not improve significantly, the yen will eventually face renewed downward pressure. The more critical question is the fading of political momentum: after the midterm elections, will the political will that drove this intervention still exist? If Japan's structural problems remain unresolved and the intervention's effect has already worn off, the market may face a more severe test than it does today.
The yen may have stabilized temporarily. The real stress test will come after the elections.
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