Traders Win as Nations Provoke Swings With Protests

The growing chorus of government officials around the world bemoaning the inflated levels of their currencies is proving to be a bonanza for traders. A JPMorgan Chase & Co. index that tracks volatility measures by options in the $4 trillion-a-day foreign-exchange market has risen almost 2 percen…

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Traders Win as Nations Provoke Swings With Protests