volatility smirk 这个 put 和 call 后面的百分数代表什么？

原版书reading13 example 7中，计算net portfolio durations，权重为什么是以long+short的总敞口为分母，而不是以净敞口为分母？

buying VIX is relatively cheaper than VIX futures 这句话对吗？

老师，原版书reading14的example 30，字啊计算rating categroy A的excess return时，怎么算不出来4.03%？题干中写的是credit spread 和 expected loss both fall by one-third,那么代入数字不应该是1.4%+（-5.5*(1.4/3)）-0.07%=3.89%?好像跟原版书算的4.03%不一样，老师能否帮我看下，我的公式是哪里有错？

错题 mock 第二个题 exchange fund说7 年investment horizon 这个在原文中没看到啊？

这道题问的是求equity的duration，和求portfolio的duration是一回事吗？

R18原版书课后题11题，选项B为什么不对，题目说portfolio has high active share ，选项C multi factor manager 满足这个条件吗，麻烦解释一下选项B和C

超额收益公式最后一项POD*LGD到底用不用去年化？***老师基础班讲的用。好多人问了，能不能说清楚呢？如果有勘误，没时间看了谢谢！

请问下5月31号后这门课还能学习吗？因为我是八月的考生，没看到有八月三级的视频啊

CFA 网站上有道题计算opportunity cost: Morrison has been working on executing a sell order to liquidate shares in Acme Industrials (ACME). The closing price on Tuesday was $79.90. Morrison received the order from Wright before the market open on Wednesday morning to sell 50,000 ACME shares with a day limit of $80.00. No part of the order is filled on Wednesday, and the stock closes the day at $79.60. On Thursday morning, Morrison instructed a new day order to sell the 50,000 shares at $79.50; 30,000 shares were sold at $79.50 per share, with resulting commissions and fees for the trade of $0.02 per share. Shares for ACME closed the day Thursday at a price of $79.40 per share. No further attempts were made to sell the unfilled 20,000 shares, which were canceled. 答案是 Opportunity cost = 50,000 – 30,000 = 20,000 × ($79.90 – $79.50) = $8,000. 我觉得是错的，应该是 (79.9-79.4)*20,000 是 决策价格和收盘价的差价。