在不完全市场条件下,通过确定方差-最优鞅测度,给出了动态均值-方差有效策略和有效前沿的解析表达式.动态均值-方差有效策略是二基金的买入-持有策略.基金一仅投资于无风险资产,基金二是动态调整的投资组合.应用资产的动态参数清楚地刻画了投资者持有二基金的数量和二基金的动态投资组合.并且证明了均值-方差有效前沿在期望收益-标准差空间是直线.
The dynamic mean-variance efficient strategies and the efficient frontiers are explicitly derived in an incomplete market. Every dynamic mean-variance efficient strategy can be viewed as buy-and-hold combinations of two funds: the zero-coupon bond and a continuously rebalanced portfolio. The two funds are clearly expressed with the parameters of the assets in the market. And the mean-variance efficient frontier is proved to be a straight line in the mean-standard-deviation diagram.