问题如下：
Monteo meets with a third client, Jayanta Chaterji, an individual investor. Monteo and Chaterji discuss mean–variance optimization. Chaterji expresses concern about using the output of MVOs for two reasons:
Criticism 1: The asset allocations are highly sensitive to changes in the model inputs.
Criticism 2: The asset allocations tend to be highly dispersed across all available asset classes.
Which of Chaterji’s criticisms of MVO is/are valid?
选项：
A. Only Criticism 1
B. Only Criticism 2
C. Both Criticism 1 and Criticism 2
解释：
A is correct.
One common criticism of MVO is that the model outputs, the asset allocations, tend to be highly sensitive to changes in the model. Another common criticism of MVO is that the resulting asset allocations tend to be highly concentrated in a subset of the available asset classes.
MVO为什么比较集中？
原版书的Example 10 同学也可以参考一下。