Selling repackaged credit, commodity, and real estate risks to investors has made many bankers rich. Now they re eyeing currencies. Today s low currency volatility may make this a good bet. But investors should note: government foreign exchange policies can change fast.

Selling repackaged credit, commodity and real estate risks to investors has made many bankers rich. Now they re eyeing currencies. Today s low currency volatility may make this a good bet. But investors should note: government foreign exchange policies can change fast.