老师，C选项中foster debate是什么意思？

老师你好 百题58题我想来想去还是觉得有些问题。因为债券复制中，债券现金流与价格的计算方式跟债券久期的计算方式是不同的。以58题为例见图二。而这道题的解法直接把复制债券时算出来的各个债券的“份数”拿来计算债券组合的久期 感觉是不对的啊。图三是以前我做错过的题，上面列的式子第一行是复制债券价格、第二行是直接用份数乘久期算组合久期，这样是错误的。但是把第二个式子改成久期和各自的权重（95.3889x/100和115.4543y/100）相乘 而不是直接乘上x和y，这样算出来就对了。

zero coupon bond不是按照面值发行的，为何将关键利率称为par rate?par rate变化导致spot rate变化，导致债券价格变化不理解，麻烦老师解答，谢谢

In a FRA or interest rate swap portfolio, which uses interest rate futures to hedge the interest rate risk, a tailed hedge means? 什么叫尾部对冲？

请问这题对冲工具的价值为什么要乘以0.1m除以100，没太听懂，每次都是买1000？

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