Popular during the bubble, these securitizations lack attributes, like large pools of loans with similar terms, to create strong demand in saner times, says Joseph Mason of Louisiana State University.

• 路易斯安那州立大学的梅森(JosephMason)说，这些证券化产品在泡沫时期很受欢迎，但在更为清醒的时期，它们像具有类似条款的大量贷款一样，缺乏激发强劲需求的属性。