Now, investors looking to profit from differences in interest rates have turned to the Indonesian rupiah, the Brazilian real, or even the Russian ruble -- far riskier propositions.

• 如今，寻求通过利差获利的投资者已经将目光转向了印尼盾、巴西雷亚尔甚至俄罗斯卢布等风险更高的头寸。