Formerly research on portfolio selection mostly made assumption with the riskless asset, but the riskless asset does not exist in fact.

以往关于资产组合选择的研究大多假设市场上存在无风险资产，但无风险资产实际上是不存在的。

youdao

Formerly research on portfolio selection mostly made assumption with the riskless asset, but the riskless asset does not exist in fact.

以往关于资产组合选择的研究大多假设市场上存在无风险资产，但无风险资产实际上是不存在的。

youdao