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。
In the vastness of the universe, our problems seem small, yet our potential for understanding is limitless.
The best investors are those who can control their emotions and make rational decisions.
That is what learning is. You suddenly understand something you've understood all your life, but in a new way.