押题卷 第43题完全没听懂 WAC和WAM是什么意思？

老师这道题，如果把cost折到指数上应该怎么处理，我知道是除以价格，我不明白的是，题目说cost在每月初付款，那么如果要折到指数，月初的第一笔算不算？第三笔又怎么算？

股票价格跌至1不是deep out of the money call吗deita应该趋近于零啊

这一页的PPT，明白的写了EL=PD×LGD≈C＋L，为什么刚才做题的时候写PD×LGD=C

这里的59 和 60题，为何算CAPM forecast不需要用Rf＋beta✖️（excess market return）？而是直接用beta0.8✖️6%？（59题，60同理）

为什么Credit Risk=PD×LDG，这个公式没见过啊

时间对溢价债券、折价债券和平价债券分别有什么影响？

习题册139: a bank creates ABS from its pool of subprime mortgages. Subsequently, the bank created ABS CDO from the mezzanine tranche of the ABS. Each structured security has 3 tranches. The senior tranche of the ABS CDO has: C, lower risk than the equity tranches of both the ABS and ABS CDO D, lower risk than both the equity and mezzanine tranches of the ABS 这个题我之前提过一点，我再详细记录下：这里为何一下说ABS一下说ABS CDO，以及他们到底属于三层的哪一层？有点晕，望解答

143习题册 the use of ABCP and repos by banks to fund investment mortgages led to problems because: A, the commercial paper was unsecured. B, it exposed banks to funding liquidity risk C, the duration of the liabilities exceed the duration of the asset D, ratings agencies provided unrealistically high ratings for the assets.这个题各个选项麻烦解释下

在Enron的案例中，aggressive accounting techniques should be highly scrutinized by investors, or the target company should be avoided as a potential investment.怎么理解