请问Short BRL 为什么是借BRL？

错题 global macro 不是有异质性吗？所以为了放大收益会加杠杆吗？这个是不是错了。

请问这个case的第1小题，对应材料中的the technique used to construct the new index portfolio assumes that the factors used to explain stock returns are uncorrelated对解题起了什么作用？

老师好 请问policy owner 的 insurable interest 指的是什么？谢谢

老师好 请问 在计算amount of benefits/coverage 时, needs analysis method 和 human life value method 的区别是什么？谢谢

R7原版书例题第4题，第一问的答案最后一句话Proposal C would be appropriate if the goal was focused on reducing surplus risk rather than reducing long term contributions，不太理解这句话中的surplus risk 指的是什么，为什么延长债券的久期可以减少surplus risk

错题 availability是不是更好？但觉得c也比a对啊。因为有历史数据所以被锚定了吗。

这个题前面都没描述portfolio和印度卢比的关系 难道单纯的long forward不行吗？

老师，看到百题答案里有一句话An indexer (full replication approach) or enhanced indexer would keep the duration matched to the index. 作为AO的管理方式，pure indexing和enhanced indexing都要确保久期与基准完全一致吗？

Key rate duration is one established method for measuring the effect of shifts in key points along the yield curve. In this method, we hold the spot rates constant for all points along the yield curve but one. 老师，这句话怎么理解？