NO.PZ201712110200000112
问题如下：
A flight to quality is most often associated with:
选项：
A.a general rise in the level of interest rates.
bullish flattening.
bearish flattening.
解释：
B is correct. A flight to quality is most often associated with bullish flattening, in which the yield curve flattens as long term rates fall by more than short-term rates.
A flight to quality 我能明白，老师上课也讲清楚了，就是经济不好的时候，大家会去购买质量高的短期国债，使短期国债的价格提高
那这里怎么判断 bullish flatten 和bearish flatten怎么联系上，
bullish flatten不是为了控制通胀，防止收益率曲线过于陡峭吗？
