简述多种证券组合的可行域。
多种证券组合可行域的形状依赖于可供选择的单个证券E(ri)和σi,以及证券收益率之间的相互关系ρij,还依赖于投资组合中权数的约束。同时可行域满足一个共同的特点:左边界必然向外凸或呈线性,即不会出现凹陷。
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