是不是可以认为方差越大，MAD也越大？

call option的意思就是看涨期权吗，那看跌期权的英文是什么

老师，那income tax expense 不也是 financial statement里面的 利润表里的一项吗，为什么不能选呢

这个公司分析是在哪里说到的?好像感觉 课程中没有涉及 这块嘛

国家经济好的话,利率是下降还是上升 ?债券的 收益率是下降还是上升 ?

为什么要减去两个10月费用，在初始资金里已经加上了10元的费用？

Module 1-书（2022-L1V1）P22-Example 2-（1）Solution to 1,为什么要考虑For her birthday, a friend gave her a one-month club membership as a gift, and that month she saw 12 movies？为什么要拿这个条件下的12 movies与正常预算情况下可购买6 movies相比较？题干中说的是，In months that she does join the club, she sees eight movies. 而不是For her birthday, a friend gave her a one-month club membership as a gift, and that month she saw 12 movies. （2）Solution to 2，不太能理解，为什么the income effect of the price decrease has been removed by charging her the monthly fee?以及怎么结合后一句话一起理解？So the increase from six movies to eight is the result of the substitution effect.（3）Solution to 3, 因为movies不是必需品essentials, 所以判断movies are not a Giffen good ? 另外，不太能理解Solution to 3的最后一句话，The substitution effect caused her to buy two more movies, and the income effect caused her to buy an additional four movies.请解析

spreadsheet models 是什么？怎么做预测

为什么不用考虑在外发行股份数，这类问题除了拆分都直接用总价吗

题干和C选项都是投资者可以提前拿回钱，为什么不选呢？