MBS和公司债哪个评级高?为什么?

老师 83题 这个自由度是用图表里面1000还是用47呀? N=48 是用47还是1000呀？

请问term structure 和收益率曲线结构是同一个概念吗

请问interest structure 和收益率曲线结构是一回事吗

The market portfolio (M) contains the optimal allocation of only risky assets and no risky assets. Let the S1 be the Sharpe ratio of this market portfolio. There exists a risk-free asset. Initially, an investor is fully (100%) invested in M with a portfolio Sharpe ratio of S1. Subsequently, the investor borrows 30% at the risk-free rate, such that she is 130% invested in the market portfolio (M) where this leverage portfolio has a Sharpe ratio of S2. After the leverage (i.e., borrowing at the risk-free rate to invest 30% in M, is the investor still on the efficient frontier and how do the Sharpe ratios? A No (no longer efficient), and S2 < S1. B No, but S2 = S1. C Yes(still efficient), but S2 < S1. D Yes, and S2 = S1. 为什么改变后还在有效前沿上啊

老师，我想请问一下这道题。他问的是下面哪个是潜在的问题。A和我大致能C区分，但是B和D我不太理解，麻烦老师解答一下。这种题目遇到该怎么做呀

老师，这题C、D项怎么理解

cash or nothing put 的定价公式是否为Qe^（-rt）*N（-d2）？

老师，这个ABS在视频里没有细讲啊

为何1说法不对？