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先证明证券市场中所有证券同值变动时 ,证券有效边界将上下平行移动 .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 .
When all the securities in the securities market first change in the same value, the effective border of the securities will move up and down in parallel. Then introduce the indifference curve to show that the expected return rate in the market does not change with the change in the same direction and the change in value.