求导的步骤有问题吧

Therefore, the debt-to-equity ratio (Total debt/Total shareholder's equity) will increase because of the decrease in retained earnings (and lower shareholders' equity). 老师，用inventory小所以asset小，asset小所以equity也小得出结论可以吗

什么是MLP？

forward price不是一直不变么，因为是合同的内容。

FIFO is appropriate for inventory that has a limited shelf life and LIFO is appropriate for inventory that does not deteriorate with age. 老师，想问下原因，谢谢！

FIFO is appropriate for inventory that has a limited shelf life and LIFO is appropriate for inventory that does not deteriorate with age.

如果不行权的话，分母只+4000吗？还是维持原来的10000呢？

如果不行权的话，分母只+4000吗？还是维持原来的10000呢？

the value of the American call cannot be less than the value of the European call. 这句话不是很理解。美式可以提前行权，欧式不可以提前行权，所以欧式在到期日行权就是解析中的10.64，但是如果美式提前行权了，怎么他的价值的下限一定也是10.64呢？（考虑极端情况，0时间点行权，那美式期权价格不应该就是70-60=10吗？这样的情况下下限怎么会到10.64？）

老师 您好 请问这道case题该如何解答？