Japanese authorities may intervene in the foreign exchange market to stop the sharp fall of the yen/ Takehiko Nakao, who was vice finance minister for international affairs from 2011 to 2013, made his comments as the Japanese currency hovered near a 34-year low hit last month against the dollar. "The yen has weakened strongly against the dollar," Nakao said, citing the IMF's real effective exchange rates and the so-called Big Mac index, designed to compare the purchasing power of hamburger currencies around the world. A weak yen puts significant pressure on real incomes and household...