Traders are losing confidence in the Group of 20 finance officials' pledge to avoid foreign-exchange manipulation less than a week after the leaders vowed to stop devaluing currencies in order to prop up their economies.
Volatility among Group of Seven currencies rose to about the highest level in four months since the G20 meeting ended on Oct. 23, according to the JPMorgan G7 Volatility Index.
Euro-dollar fluctuations jumped 30 percent since Sept. 20, a day before Federal Reserve policymakers said they were prepared to buy bonds and pump more money into the financial system, data compiled by Bloomberg show.