理解布莱克-斯科尔斯模型的关键在于认识到它是基于风险中性世界的概念，在这个世界中投资者对风险漠不关心。

I'm not afraid of dying, I just don't want to be there when it happens.

I'm not going to tell them about the downsizing. If a patient has cancer, you don't tell them.

 万物起源之谜我们无法解答；至少我个人甘愿保持不可知论。