人们永远不会注意到已经做了什么;人们只能看到还有待完成的事情。
One never notices what has been done; one can only see what remains to be done.
The best buildings come from good relationships.
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。