The US Treasury recently stepped in to support the weakening yen, purchasing between $5 billion and $10 billion through the Federal Reserve Bank of New York the first such move in over ten years. This action was part of a plan to stabilize Japan's currency after prolonged weakness, but JPMorgan warns the Treasury’s toolkit for these interventions has clear limits.
Unlike the Federal Reserve, which can expand its balance sheet almost without bounds, the Treasury handles intervention with a fixed pot of foreign reserves. Spending heavily on yen purchases reduces the resources available to counter other currency shifts. JPMorgan points out that if the yen’s slide continues, the Treasury might need to resort to exceptional measures to keep up its defense.
Japan itself has dealt with volatile currency trends multiple times recently. In 2024, the Japanese Ministry of Finance intervened with about ¥5.5 trillion, roughly $35 to $36 billion, and continued buying yen in 2026 in attempts to slow depreciation. This US Treasury move adds to global efforts but remains small compared to average daily forex turnover, which hovers around $7.5 trillion.
Still, the psychological impact matters. Traders aware that the Treasury’s intervention funds are limited may doubt the staying power of this maneuver, potentially weakening its deterrent effect. The nuance lies in the scale the Treasury’s yen purchases are significant but not game-changing in a vast, fast-moving forex market.
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