"So I urged these institutions here today to go back and take a third and fourth look about how they are operating when it comes to small business and medium sized business lending,"

VOA: standard.2009.12.20

If you just look back when they were created it's most likely to be in the 1930s.

如果你回想起,你会发现那些衍生品,大多都是上个世纪30年代出现的。

耶鲁公开课 - 金融市场课程节选