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 a time of deceit, telling the truth is a revolutionary act."
A company’s true value is measured by its impact on people and the planet.
"Freedom is nothing but a chance to be better."
世界上最成功的社会是那些能够在国家、市场和公民社会之间创造平衡的社会。
Love is not a feeling, Mr. Stevens. Love is a decision.