假设一个学生只要老师给100分，他什么都愿意给。。如果这是真的，那么需求曲线会是什么形状？为什么这个做法是不真实的。。
Assume that a student told an instructor that he absolutely needed an "A" in the class and would pay anything to get it. If this were true, what shape would his demand curve have? Why isn't this realistic?
英文是原问题，中文是我翻译的，翻译的不好请见谅。。
前半部分我懂得回答，但是我不知道为什么这个是不可行的？？
