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

hazard rate指泊松分布中的λ还是指数分布种的λ？

这两种计算我理解了，但是为什么现金流折现出来的值是债券的违约概率？

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

请问指数分布的无记忆性是在什么时候才会被用到 比如这道题 题目中问的within the next three years 是不是就是靠考虑第一年不违约和第二年不违约直到第三年违约的情况？

为何1说法不对？