当投资者能够在风险与回报性各异的多种类型的证券中选择最适合他们偏好的种类时，每一种证券也能够以最适合它自身定位的价格卖出。
When investors are able to select security types with the risk-return characteristics that best suit their preferences, each security can be sold for the best possible price.
当投资者能够在风险与回报性各异的多种类型的证券中选择最适合他们偏好的种类时，每一种证券也能够以最适合它自身定位的价格卖出。
When investors are able to select security types with the risk-return characteristics that best suit their preferences, each security can be sold for the best possible price.
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