NO.PZ202305230100005408
问题如下：
What impact would a “flight to safety” (i.e., government bond yields falling and credit spreads widening) have on the analytical duration estimate of Bond A?
选项：
A.Decreased duration
Increased duration
No impact
解释：
C is correct. There would be no impact on the analytical duration estimate. However, an empirical duration estimate would be impacted. A flight to safety would result in an increase in the bond price due to the falling benchmark yield being offset by widening credit spread. This would lead to a lower empirical duration than analytical duration.
现在的情况是 “flight to safety” 也就是benchmark的收益率是下降的，而由于现在市场不好，spread是上升的
难道bencmark 的减少和spread 刚刚好抵消吗
