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## Overview The yen headed for its best day in two weeks after Japanese Prime Minister Sanae Takaichi said she told US President Donald Trump that an undervalued Japanese currency was "problematic" (Bloomberg, September 25). The verbal intervention, or "jawboning," triggered a session high for the yen (Bloomberg, September 25). ## Key Facts - PM Takaichi reportedly raised yen weakness directly with President Trump, calling the undervaluation "problematic" (Bloomberg, September 25) - The yen rallied on the comments, marking its best daily performance in two weeks (Bloomberg, September 25) - This follows a period of Bank of Japan policy disappointment that had left the yen vulnerable ## Why It Matters Currency jawboning by senior Japanese officials has historically been a precursor to actual intervention or policy shifts, and signals rising concern in Tokyo about the economic and political costs of a weak yen (import inflation, capital outflows). For markets, official rhetoric of this kind is a leading indicator of potential BOJ policy moves or coordinated currency action, with implications for global carry trades and Japanese asset prices. ## Context This development follows a broader narrative of yen vulnerability tied to BOJ policy disappointment and shifting hedge fund sentiment on the currency. Takaichi's direct engagement with Trump on currency policy also reflects the broader US-Japan economic relationship amid tariff and investment negotiations. ## Developing Questions - Whether verbal intervention will be followed by actual BOJ policy action or FX intervention - How the Trump administration will respond to Japanese currency concerns amid broader trade negotiations - Impact on yen carry trades and Japanese equity markets