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。
拯救森林靠的是合作，而非竞争。
A real decision is measured by the fact that you've taken a new action. If there's no action, you haven't truly decided.
True artistry lies in the ability to make people feel something deep and unforgettable.