Japan could intervene to arrest yen increase but only once, says former forex tsar foreign exchange Japan could intervene to arrest yen increase but only once, says former forex tsar Ignacio H. Harten January 23, 2021 By Leika Kihara, Yoshifumi Takemoto FILE Photograph: Japan Yen and U.S. Dollar notes are found in this... Read More Read more about Japan could intervene to arrest yen increase but only once, says former forex tsar