The gap between Japanese and U.S. economic fundamentals has long been a major factor behind the dollar's strong showing.
The dollar has given up much of its recent gains, however, and is now hovering around 128 yen.
Having hit a three-year high of around 135 yen late last January, the dollar appeared bound to the 130 yen level in recent months and now appears poised to test 125 yen.
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