问题如下：
Which of the following scenarios would increase the company's current capital investment?
选项：
A.The market value of the company's debt decreases.
B.The company's expected marginal tax rate increases.
C.The company's inventory increases.
解释：
B is correct.
An increase in the company's expected marginal tax rate would decrease the after-tax cost of debt, thus decreasing the company's WACC. A lower WACC would make more projects to be accepted.
A选项，这道题看了两个助教回答，一个说债券市值下降 利率上升 成本增加 ，一个说不影响成本，该怎么理解？
