题目
The covariance of returns is positive when the returns on two assets tend to:
选项
A.have the same expected values.
B.be above their expected value at different times.
C.be on the same side of their expected value at the same time.
答案
C
解析
： C is correct. The covariance of returns is positive when the returns on both assets tend to be on the same side (above or below) their expected values at the same time, indicating an average positive relationship between returns. ： C正确。 当两种资产的收益同时趋于同一方向(高于或低于)期望值时，收益的协方差为正，说明收益之间的平均正相关关系。