然后引入无差异曲线来说明市场中证券期望收益率同方向变化且变化值相差不大时，不必改变证券组合。
Meanwhile the indifference curve also shows that it is not neccessary to change the security combination when such changes in return possess similarity.
然后引入无差异曲线来说明市场中证券期望收益率同方向变化且变化值相差不大时，不必改变证券组合。
Meanwhile the indifference curve also shows that it is not neccessary to change the security combination when such changes in return possess similarity.
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