The most innovative solution is often the one nature already provided.
If you can meet with Triumph and Disaster and treat those two impostors just the same...
Responsible fishing isn't just good ethics; it's good business in the long run.
布莱克-斯科尔斯公式的美妙之处在于它仅依赖于一个不可观测的参数,即股票的波动率。