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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。
The psychologist must study the mind as it is, not as it ought to be.
I don't like to do easy things. I like to do things that are challenging and that push me.
【译文】做人不要到处拈花惹草,应洁身自好。只要五官长得好,即使不搽脂抹粉也很漂亮。