NO.PZ2023021601000021
问题如下：
Compared to the efficient frontier of risky assets, the dominant capital allocation line has higher rates of return for levels of risk greater than the optimal risky portfolio because of the investor's ability to(原版书)选项：
A.lend at the risk–free rate.
B.borrow at the risk–free rate.
C.purchase the risk–free asset.
解释：
The CAL dominates the efficient frontier at all points except for the optimal risky portfolio. The ability of the investor to purchase additional amounts of the optimal risky portfolio by borrowing (i.e., buying on margin) at the risk–free rate makes higher rates of return for levels of risk greater than the optimal risky asset possible.为什么能举杠杆收益率就会高呢？最佳组合切点前后两边有什么不同含义吗？
