# The Bigger Picture

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Japan and the US Move to Halt the Yen's 40-Year Slide Why the Yen Keeps Falling The yen's slide to levels last seen in 1986 reflects both structural and cyclical forces. The yen's decline has been fueled by a shift in expectations for US interest rates, driven largely by the war with Iran, and a rebound in the dollar. An energy price shock from the US-Iran war reinforced a weaker yen, compounded by a hawkish shift in Fed policy communication. Even though the Bank of Japan raised its benchmark rate to 1%, the highest in more than three decades, as part of its ongoing monetary normalization, the yen kept weakening because US-Japan interest-rate gaps remained wide. Japan's heavy reliance on imported energy amplifies the pain, pushing up import costs and inflation. Washington and Tokyo Join Forces Facing a fresh 40-year low, Japan and the US jointly intervened, the first coordinated action since 2011, when the two nations acted after Japan's earthquake and tsunami. Notably, the New York Fed reportedly sold euros rather than dollars to fund the yen purchase, an unusual technical choice. Previous joint US interventions came in 1998, during the Asian financial crisis, and in 2011. Tokyo may have sold as much as $59 billion to buy yen before the confirmed joint move, while Washington's contribution was smaller but symbolically significant. Both governments have signaled readiness for repeated action and closer communication between the MOF, Treasury, and Federal Reserve. Interest Rates, Fiscal Policy, and the Limits of Talk Beyond intervention, bilateral options include coordinated rate guidance and liquidity tools. Bessent has pushed for the Fed to expand a lending facility that would let Japan support its currency without disrupting the Treasury market, and the FIMA repo facility lets Japan raise dollar liquidity without outright Treasury sales, easing funding pressure. On the Japanese side, further BOJ rate hikes and credible fiscal discipline under Prime Minister Takaichi could narrow the yield gap that drives capital toward dollar assets. Verbal coordination — joint statements affirming exchange-rate stability — has also become a tool in itself, sometimes moving markets before any dollars are spent. Trade-offs and Risks Each option carries costs. Analysts note that Japan's currency intervention is typically tiny relative to the roughly $29 trillion Treasury market, limiting its impact on US yields. Faster BOJ rate hikes risk unsettling Japan's heavily indebted government bond market and could accelerate an unwinding of the yen carry trade, in which investors borrow cheaply in yen to fund purchases of higher-yielding assets elsewhere. There are also concerns that a Japanese sell-off in Treasuries to fund yen purchases could push up US borrowing costs. Meanwhile, skeptics such as Bank of America's FX strategists have suggested intervention can only buy time rather than reverse the underlying trend, and some economists have called Washington's involvement an unusual departure from its traditional "strong dollar" stance. Global Spillovers A disorderly yen matters well beyond Japan. The weak currency has pushed up import prices and stoked inflation, straining households and denting the prime minister's approval ratings. A sharp, chaotic depreciation could ripple into global bond and equity markets, given Japan's role as the largest foreign holder of US Treasuries. In a sign of broader regional coordination, South Korea also intervened to support its own currency, illustrating how yen weakness pressures other Asian currencies and can trigger competitive responses. Emerging markets reliant on dollar funding face tighter financial conditions when the dollar strengthens broadly, while a sudden yen rebound could unwind leveraged carry trades, generating volatility across global asset classes. Outlook The joint intervention has offered temporary relief, but most analysts view it as a stabilizing pause rather than a structural fix. UBS strategists have argued Japan's current policy mix is unlikely to generate sustained yen strength without further monetary tightening and fiscal credibility. Continued close bilateral communication, gradual BOJ normalization, and selective, well-telegraphed intervention appear the most realistic path to reducing volatility — though a durable turnaround likely depends on narrowing rate differentials and calmer global energy markets.   Sources Bank of Japan – https://www.boj.or.jp/en/ Japan Ministry of Finance, FX policy – https://www.mof.go.jp/english/policy/international_policy/index.html U.S. Department of the Treasury – https://home.treasury.gov/ Federal Reserve – https://www.federalreserve.gov/ IMF – https://www.imf.org/en/Topics/exchange-rate-policies BIS – https://www.bis.org/ CNBC: https://www.cnbc.com/2026/08/03/yen-intervention-us-japan-trump-bessent-katayama.html Youtube Videos Reuters, "Japanese yen sinks to 40-year low against the US dollar as intervention looms" – https://www.youtube.com/watch?v=r7pfDR9oy-w BNN Bloomberg, "Yen hits 40-year low, should the markets be worried?" – https://www.youtube.com/watch?v=NFa_BFiFqEI "Strong dollar pushes yen to 40-year low as clock ticks on intervention" – https://www.youtube.com/watch?v=HXAoNNpbGBA "Why Japan's Yen Just Crashed To A 40-Year Low | FP Explains" – https://www.youtube.com/watch?v=_izGu6gC6Ek "Yen slides to weakest level in nearly 40 years" – https://www.youtube.com/watch?v=g3PZoLKKOL8