Japan’s Currency Crisis Is Now America’s Problem
In a Nutshell
Japan's massive yen carry trade—borrowing yen at ~1% to buy US Treasuries at 4-5%—is unraveling as the yen hits 40-year lows. Japan's emergency intervention requires selling US Treasuries, its largest holding, which floods the market and pushes long-term yields higher. This creates a feedback loop where the interest rate gap between the US and Japan forces repeated interventions until either the Fed cuts rates or Japan raises them enough to end the trade.
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United States banks have been warned to prepare for a possible intervention of the Japanese yen after its value recently fell to its lowest level in 40 years. Japan holds so much of its own money in US dollars that if forced to sell to prevent their currency from collapsing, this could trigger a global reversal across the entire economy.
Global economies are interconnected where what happens in one country affects others. When a currency is weak, money flows out into something safer, typically US dollars or US Treasuries as the reserve currency of the world. Every country has their own currency, interest rate, and inflation indexed to how many dollars they can purchase, creating arbitrage opportunities where traders borrow cheap in one currency and buy US dollars at higher interest rates to profit the difference.
For nearly 40 years, the value of the Japanese yen has been on a steady decline due to decades of deflation, an aging population, and weak demand keeping interest rates near historic lows. Japan maintained this system because inflation was non-existent until the United States raised interest rates at the fastest pace in history to battle record-high inflation from 2022 and 2023.
Traders borrowed yen at approximately 1% interest, converted to US dollars, and purchased US Treasuries earning 4-5% interest. For example, borrowing 1.6 million yen at 1% interest converts to $10,000, which can then purchase 12-month Treasuries earning 4%. After 12 months, the $10,400 converts back to approximately 1,650,000 yen, allowing repayment of the original loan plus interest while retaining roughly $400 profit, all while the yen's steady decline against the dollar enhanced returns.
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