老师在讲lasso的时候说一个b对应一个入，但是入应该是不变的吧

两个问题： 1、优先股的股价不就是等于D1/r吗？为什么解答求了PV以后还要折现一次？ 2、题干划横线那句话是什么意思？特别是in five quarters

老师，两个问题：1.为什么AD线不发生shift, 2. 为什么IS线和LM线的slope方向是相反的，既然都追踪的同样的两个因素（r和Y），是因为两个curve假设的均衡是不一样的，对吗？

19题和20题可以讲解一下吗

Christophe Inc. is an electronics manufacturing firm. It owns equipment with a tax basis of $800,000 and a carrying value of $600,000 as the result an impairment charge. It also has a tax loss carry forward of $300,000 that is expected to be utilized within the next year or two. The tax rate on these items is 40% but the tax rate is expected to decrease to 35% for the foreseeable future. Which of the following amounts is closest to the net effect of the change in tax rate on the income statement? A Increase in deferred tax expense of $5,000. B Decrease in deferred tax expense of $5,000. C Increase in deferred tax expense of $25,000. 我觉得DTA不是最后减少了50万&5%，为什么最后是增加的呢？

为什么不选b呢

这里的total return是百分比形式，还是代数值形式啊？看上去各组成部分部分，都是百分比的形式。

老师，这里的1.2 million的face value是如何得来的？之前算出需要12份合约，意味着每份合约的价值是10万？不太明白。谢谢老师

要看显著性水平，是不是用P-value和阿法值比较？这题没给阿法值，只有t检验值-3.0565，请问如何判断显著性水平？（题目是多元回归课后题第三题B）

老师，在什么情况下会有insider discloses the information 却不违反 fiduciary duty的情况？我觉得如果insider泄密了，insider肯定违反了standard ：conservation of confidentiality的。