当且仅当所有投资者都持有均值-方差有效的投资组合时,市场组合才是有效的。
一个社会的真正考验在于它如何对待最脆弱的成员。
All are gurus to us, the wicked by their evil deeds say 'do not come near me'. The good are always good, therefore all are like gurus to us.
小小的善举比你可能预期的更能提升你的情绪。
我们要做的是让数据成为每个人的财富。
I'm not perfect, but I'm perfectly me.