U.S.-Japan joint intervention viewed as a new 'Plaza Accord' and the beginning of Bretton Woods 2.0

Original author: Ye Zhen

Source: Wall Street Journal

The U.S. and Japan have jointly intervened to support the yen, a move rare in decades, prompting markets to reassess global capital flows long reliant on low-interest-rate yen financing. Some strategists believe that if this policy direction persists, it could mark a turning point for yen carry trades and drive deeper reallocations of global capital.

U.S. Treasury Secretary Bessent, alongside President Trump, confirmed over the weekend that the United States has been actively involved in supporting the yen. Bessent explicitly stated that the U.S. will not hesitate to participate in further coordinated interventions to correct the yen’s significant undervaluation. Meanwhile, Trump emphasized that this intervention reflects the U.S.-Japan alliance and anticipated that Washington would realize substantial financial gains from this joint effort.

This rare policy coordination triggered a sharp reaction in financial markets. With official direct buying, high-level verbal intervention, and guidance from relevant authorities to trading banks, the yen strengthened to 157.40 against the U.S. dollar toward the close of trading in New York, marking its strongest level since early May. Just two days earlier, the yen had been hovering near its lowest level since 1986.

Market analysis indicates that this U.S.-Japan alliance action has moved beyond conventional currency management. As Japan may sell its foreign exchange reserves to defend its currency, the long-end repricing of U.S. Treasury yields is driving global capital markets into a new normal dominated by liquidity restructuring.

According to Bloomberg, Japan's Ministry of Finance and the U.S. Department of the Treasury are currently supporting the yen with a level of cooperation unseen in decades.

U.S. Treasury Secretary Bessent posted on social media platform X that the U.S. Treasury remains closely monitoring the situation and maintains close communication with Japan’s Ministry of Finance and the Bank of Japan. He also emphasized that the FIMA repo facility is an important backstop, and the U.S. encourages expanding the scale of this tool over the coming months.

Details of the intervention are gradually coming to light. According to Reuters, during a cabinet meeting at Camp David, Besant’s notepad clearly listed “Buy $5 billion to $10 billion in yen” as an action item. Additionally, Bloomberg, citing informed sources, reported that Japan’s Finance Minister Satsuki Katayama could announce specific measures for coordinated U.S.-Japan foreign exchange market intervention as early as Monday to curb excessive yen depreciation.

On the political level, President Trump told reporters aboard Air Force One that the United States is ready to assist Japan at any time, signaling the strength of the two countries' friendship. When asked what benefits the U.S. could gain from this, Trump drew a parallel with last year’s currency swap agreement with Argentina, noting that the U.S. ultimately earned $25 billion from the Argentina swap and anticipated similar financial gains from this intervention.

The strong rebound of the Japanese yen is not only a result of intervention, but also touches the underlying logic of the global financial system.

Since the 1980s, Japan has been at the heart of global yen carry trades, maintaining a financial order built on cheap leverage and central bank engineering by exporting savings and suppressing yields.

Analysis indicates that as quantitative easing is phased out and yen carry trades are nearing their end, this old order is unraveling. Future interest rates will be increasingly determined by the capital markets themselves, rather than unilaterally set by central banks.

James Thorne, Chief Market Strategist at Wellington Altus, analyzed that Bessent’s recent actions indicate the U.S. Treasury clearly recognizes that the long-end movements in the U.S. Treasury yield curve are driven by capital flows. If Tokyo must defend the yen, Japan’s Ministry of Finance may need to sell U.S. Treasuries. When the world’s largest overseas holder of U.S. debt becomes a seller, the long-end yields of U.S. Treasuries will inevitably face reassessment.

In response to the rise in long-term U.S. Treasury yields, Wall Street has largely attributed this to "inflation risk," but market data does not strongly support this view. Currently, breakeven inflation rates remain anchored, and credit markets have not priced in a new inflation regime.

Analysis suggests that the true drivers are Japan’s foreign exchange reserve liquidation and a global adjustment process that has not yet been fully recognized by the market. Additionally, the changing role of large technology companies as capital providers has further intensified this pressure. Tech giants that once absorbed duration are now issuing bonds on a large scale to invest in artificial intelligence infrastructure, data centers, and chips, transitioning from savers to borrowers of credit.

These long-term forces are tightening global credit conditions. In a global economy long reliant on arbitrage trades, this deleveraging process requires exceptional skill. Central banks need to support this global liquidity adjustment through interest rate cuts, rather than viewing it merely as an inflation alert.

Analysis suggests that the current foreign exchange market movement is not merely a technical intervention, but also signifies the beginning of a new "Plaza Accord" and Bretton Woods 2.0.

The United States is emerging from prolonged stagnation through supply-side economics, deregulation, and productive investment, accelerating economic growth. Analysis suggests that a Fed led by Walsh would be well-suited to this new landscape, as economic growth would no longer be viewed as a policy failure.

Meanwhile, Japan may also ultimately undergo a restructuring of its economic structure and geopolitical role.

Whether this coordinated intervention proves to be merely a short-term currency stabilization effort or the beginning of longer-term international policy coordination, it has already forced markets to reassess the yen carry trade model that has persisted for decades, as well as potential new shifts in global capital flows.