NO.PZ2020011303000040
问题如下：
What are the properties of a portfolio that is represented by a point on the efficient frontier?
选项：
解释：
It is a portfolio such that there is no other portfolio with both a higher expected return and a lower standard deviation of return.
有效前沿上的组合有什么特性？
在风险一定的情况下收益更高，收益一定的情况下风险更小。
老师好，请问这个在讲义第几页呀
