A surging dollar is pummeling currencies around the globe amid efforts to boost economic growth, prompting a wave of investor bets to profit from the upheaval. Many global central banks are weakening their currencies as they try to counter signs of economic gloom, signaled by falling commodity prices, declining inflation and softening growth expectations. Those shifts, together with moves such as this month’s surprise decision by the Swiss National Bank to abandon its three-year-old policy of limiting gains in the Swiss franc against the euro, have fed a jump in the price swings of currencies. These dynamics are tempting investors to make large bets on currency moves, potentially fueling further exchange-rate shifts.

http://www.wsj.com/articles/investment-firms-emboldened-by-swiss-franc-surprise-1422558263