问题如下：
Which of the following phenomenons is often referred to as the “peso problem"
选项：
A. Looking backward, we are likely to underestimate ex ante risk and overestimate ex ante anticipated returns.
B. Looking backward, we are likely to overestimate ex ante risk and overestimate ex ante anticipated returns.
C. Looking backward, we are likely to underestimate ex ante risk and underestimate ex ante anticipated returns.
解释：
A is correct.
解释：
“peso problem"通常是指在解释给定样本期间的历史价格和收益时，分析师需要评估资产价格是否反映了在此期间没有发生的非常负面事件的可能性。所以回顾过去，我们可能会低估事前风险，高估事前预期回报。所以只有A选项正确。
事前预计风险很高，会高估风险，同时也会高估收益率啊
