In a striking turn of events, Japan’s yen has recently fallen closer to 160 per dollar, raising concerns among economists and traders alike. This slide follows unprecedented intervention by the Trump administration, aimed at stabilising the yen amid fears of its role as a low-cost funding source for global finance. As the US Treasury Secretary Scott Bessent steps into the fray, the intricate relationship between the two nations’ economies becomes increasingly clear.
The Yen’s Decline and US Intervention
In early August 2026, traders reacted to Japan’s currency dipping towards a 40-year low, despite a concerted effort by the US to bolster the yen. Donald Trump remarked, “Japan’s been very good to us, with the exception, of course, of Pearl Harbor,” highlighting a complex diplomatic history. The US administration’s intervention is not merely an act of goodwill but a strategic move to maintain a lucrative financial pipeline that benefits American markets.
The concept of the “carry trade” — where investors borrow in low-interest currencies such as the yen to invest in higher-yielding assets like US tech stocks — has become pivotal. This practice has been instrumental in fuelling the American stock market, especially as AI investments continue to surge, consuming over 1% of the US GDP.
The Stakes of Currency Stability
Bessent’s intervention involved selling at least $10 billion in euros to purchase yen, aiming to halt the currency’s depreciation. However, this action underscores a broader reality: the US prioritises its allies based on their utility. The implications of a collapsing yen extend beyond Japan; they threaten the stability of US markets, which are intricately tied to Japan’s economic decisions.
As oil prices rise due to escalating tensions between the US and Iran, Japan faces mounting inflationary pressures that could further weaken the yen. If the currency were to drop to 164 yen per dollar, aggressive interest rate hikes by Tokyo could ensue. Such moves, however, would likely stifle Japan’s investment ambitions and could trigger a chaotic market sell-off in the US.
The Alternative: Managing Treasury Holdings
Bessent is aware of the precarious balance he must maintain. The alternative to stabilising the yen — Japan liquidating its substantial $1.1 trillion in US Treasury holdings — would drive up interest rates and escalate Washington’s borrowing costs. To circumvent this, Bessent has enabled Japan to secure dollar loans against its Treasury assets, providing essential liquidity without destabilising the US debt market.
Using a Federal Reserve lending facility, he hopes to significantly increase the current daily limit of $60 billion available for such transactions. This strategy not only allows Japan to bolster its currency but also ensures that the US maintains control over its financial landscape.
A Historical Perspective on Currency Intervention
Bessent’s history as a currency trader adds a layer of intrigue to the current situation. He previously orchestrated significant financial maneuvers, notably earning George Soros billions by betting against the British pound and the Japanese yen. His approach now seems to suggest that he believes it is possible to rewrite market rules — a sentiment echoed by Margaret Thatcher’s assertion that one cannot “buck the market.”
Bessent’s challenge is to convince traders that a return to 164 yen per dollar is not inevitable, leveraging both historical expertise and current market dynamics.
Why it Matters
The ongoing currency fluctuations between the US and Japan carry significant implications for global financial stability. As the two nations navigate their economic relationship, the decisions made today could reverberate through international markets, impacting everything from tech investments to inflation rates. Understanding these dynamics is crucial for investors and policymakers, as they highlight the delicate balance of power in global finance and the potential risks of currency instability.
