In other words there was not enough data on these things, in other words, with other conventional mortgages, you have data covering peace and war, prosperity and depression and so forth and you can follow these data back for decades.

换句话说,关于这些新增贷款没有足够数据，换种说法，和其他传统贷款相比，你有和平和战争时期的数据，有市场繁荣和萧条时的数据等等,你可以追述这些数据。

斯坦福公开课 - 经济学课程节选