理解布莱克-斯科尔斯模型的关键在于认识到它是基于创建无风险对冲的理念。
The power of literature lies in its ability to make us see the world in a new way.
幸福,就像不幸一样,是一个主动的选择。
There is no such thing as society: there are individual men and women, and there are families.