Over the boom period, we've been seeing a gradual uptrend; just as loan to value ratios were only 60% in the 1920s, now they're up to 90% or 100%.

在繁荣时期可看到一个逐渐上升趋势,上世纪20年代贷款价值比率只有60%,现在飞升至90%或100%

耶鲁公开课 - 金融市场课程节选