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。
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法。
凡理性的投资者将选择并持有有效的投资组合,即那些
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给定的风险水
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下使期望回报最大
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的投资组合,或那些
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给定期望回报
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的水
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上使风险最小
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的投资组合。同样,理性的经理人也
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均变动条件下最优回报的追求者(mean-variance optimizer)。但
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接受股权报酬激励的经理们往往受到投资组合多元
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限制,因而只能
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面临特定风险的条件下寻求次优的回报。对于没有投资组合多元
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限制的经理而言,市场组合(market portfolio)可以代表一种可行的投资组合,因为它
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