1906基础段视频中提到VER类似与Import quota, 为什么VER导致更大的welfare loss?

老师，理论上，B和C一样，市值也是一样时刻变动，为什么优先选B

Company A and B operate in the same line of business and have the same degree of operating leverage. The Company A has no debt while the Company B has 50 percent debt in its capital structure. Which of the following statements is most accurate? Compared to the Company A, the Company B has: A A lower sensitivity of net income to changes in unit sales. B The same sensitivity of net income to changes in operating income. C The same sensitivity of operating income to changes in unit sales. 老师，您好，这个题怎么理解，

a和c都是正确的

对C的讲解是不是有误？ 拒绝H0不就等于接受Ha吗？因为H0和Ha是对立且完备的，必有一真啊。 C选项应该是错在，test is conducted后，H0不一定就是错的，可能无法拒绝H0.

请问C为什么不对呢？If inventory level is decreasing-->liquidation-->LIFOR should decrease. 只是因为C不是most likely answer?

这题视频老师讲错了吧？要求的是第二年的gross profit不是总的profit；所以求出来还要再减去第一年的profit。如答案那样算才是对的

正态分布的值不是在0至正无穷么？

A=-4不应该是risk-seeking了吗 为什么还会是risk aversion?

请问警告信和警告有什么区别？cautionary letter不算处罚，censure算处罚，怎么区分？