Following the joint involvement the yen now sits at ¥157 to the dollar, down from just above ¥163, which represented its lowest level in four decades.

July 31 : The U.S. Treasury intervened to support the yen on Friday through outright purchases, the Financial Times reported, joining Japan in its efforts to boost the currency…

New York/Washington, July 31 (Jiji Press)--The dollar plunged below 157.50 yen for the first time in about two and a half months in New York trading on Friday as the Japanese and…