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

Once an invention is seen to work it is rapidly copied around the world.

而当一种创新品运行顺畅的时候,就会在世界范围内被模仿

耶鲁公开课 - 金融市场课程节选

Now, if that happens these homes are the collateral to the banks for all these mortgages and we're going to have -and probably do have already--a recession.

如果那种情况发生了的话,这些房子是银行对房屋抵押贷款的唯一担保品,那我们将会面临,-很可能现在正在面临着--经济衰退。

耶鲁公开课 - 金融市场课程节选