老师可不可以再说一下怎么使用金融计算器，我按完CPT PV为什么不显示

老师您好，原版书课后题第5题（详见图片）的B选项中的idiosyncratic risk是不变吗？有增加的可能吗？答案里没有讲，所以我想问一下您，谢谢。

A professional code of conduct： A. can increase public trust in the profession. B. guarantees that members will adhere to a minimum level of ethical conduct. C.includes standards that provide guidance for specific behaviors. 选哪个，再帮我解释下，谢谢哈

为什么负数形成DTA？

降维究竟是降低数据个数还是变量个数

老师，还是不明白key rate duration和par rate关系。par rate 怎么刚好对应每个时点的spot rate呢？自展不是从Par rate1推S1，再推S2吗，也不是从par rate2推spot rate2啊。

Changing the inventory cost flow assumption to LIFO is an exception to the retrospective application of changes in accounting principle. This change is applied prospectively, with the carrying value of inventory on the date of the change as the first LIFO layer. 请问这个规定是只在US GAAP准则下适用呢还是IFRS下也适用？

Changing the inventory cost flow assumption to LIFO is an exception to the retrospective application of changes in accounting principle. This change is applied prospectively, with the carrying value of inventory on the date of the change as the first LIFO layer. 请问这个规定是只在US GAAP准则下适用呢还是IFRS下也适用？

11.单选题 已收藏 标记 纠错 A condition appears that the new project reduces the cash flows of an existing project, then this phenomena can be best described as a(n): A Sunk cost. B Opportunity cost. C Externality. 查看解析 上一题 提交试卷 正确答案C 您的答案B本题平均正确率：68% The basic of capital budgeting难度：容易 推荐：      答案解析 A new project reducing the cash flows of an existing project is an externality called "cannibalization". 问：机会成本和负面的外部性 最大的区别是什么？如何一针见血的分辨？

老师好，14题，c选项，5%的显著性水平不是应该是two tailed test 的拒绝域吗