Yen Gains as Stimulus Seen Failing to Spur Growth

The yen strengthened after reaching a four-week low versus the dollar as investors speculated the Bank of Japan’s unexpected monetary stimulus expansion will do little to augment economic growth.

The yen gained against almost all of its 16 most-traded counterparts even after policy makers added 10 trillion yen ($127 billion) in stimulus, following measures by the Federal Reserve and European Central Bank this month. South Africa’s rand tumbled even as platinum miners agreed to return to work following a strike. New Zealand’s dollar declined after the current account deficit widened to the most in three years.