The market portfolio is efficient if and only if all investors hold mean-variance efficient portfolios.
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。
走路，应缓慢又稳健；站立，应端直又恭敬；坐着，应端庄又平正；说话，应低沉又和缓。
The value of information is not in knowing more, but in knowing what others don't know.
We are all capable of understanding the deepest secrets of the universe.
The best investment advice is often the simplest: diversify, keep costs low, and stay the course.