老师，请问这页最后一段不太明白，fewer positions就一定是concentrate positions吗？为什么会产生higher estimation errors？为什么用formal risk measures会more difficult？

老师，请问formal risk measures require forecasts of return distribution，which introduces estimation error怎么理解？

这道题根本不会做 上次问的 给的回答没说清楚 麻烦具体解释下 年金键每个值多少 具体怎么得出数

老师，请问为什么cash has an active risk twice of benchmark？cash contribution to 100% of the active variance是什么意思？active variance指什么？最后一段不太理解是什么意思？

老师，请问sector rotator是指什么？最后一段是什么意思？flexibility为什么会产生active risk和return？

老师 请问视频里的百题讲解 百题在哪刷

“short”在这里是借的意思吗？不是应该是卖出巴西币的意思麽，卖出巴西币说明，Sophia老师解题答案的第一行没看懂。另外，巴西币利率高，套利的话不是应该一开始借美元，换成巴西币投资，一年后换回美元吗？

老师请看第7题～ 我不是很能理解这句话～ 可以麻烦老师解释一下吗～ a country captures more of the gains from trade the more the final terms of trade differ from its autarkic prices

老师请看第7题～ 我不是很能理解这句话～ 可以麻烦老师解释一下吗～ a country captures more of the gains from trade the more the final terms of trade differ from its autarkic prices

Which of the following is least likely classified as an opportunity cost? A The cash flows generated by an old machine that is to be replaced B The cash savings related to adopting a new production process C The market value of vacant land used for a distribution center