Since the 1990s, we've seen a proliferation of new kinds of mortgages that especially are offered to low-income people by certain lenders.

从20世纪90年代,我们看到一种新型抵押贷款在快速发展,它由特定贷款人向低收入人群发放

耶鲁公开课 - 金融市场课程节选