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Currency traders are struggling to parlay volatility into profit

The varying policy stances in the world's biggest economies are aggravating foreign-exchange moves and stoking speculation about competitive devaluations, known as a currency war.


CURRENCY traders are getting whiplash from the pile-up of policy surprises that have come their way in the past six months. And because the big events have been unexpected, they're in a bind to translate rising volatility into bigger profits.

The Bank of Japan's decision to...