问题如下图：
选项：
A. 
B. 
C. 
D. 
解释：
Spread 越来越小，但是下降得越来越平缓，对应的PDshi是上升还是下降？程度呢？ 答案说因为累计PD分布是一直增加的，但是后面体积的短期的PD是关联性很高的，这个不是很理解，他增加的斜率为什么是steep的呢？
NO.PZ2016082405000030 analyst is stuing the C sprecurve for establishecompany. The 1-, 3- an5-yesprea are 400 bps, 200 bps, an150 bps, respectively. Whiof the following interpretations of the ta is most likely correfor the shape of the fault stribution? fault stribution Near-Term Slope Upwarsloping flslope wnwarsloping steep slope Upwarsloping steep slope wnwarsloping flslope C The C sprea incate a wnwarsloping sprecurve. Note ththe cumulative stribution of fault is always increasing regaress of the slope of the sprecurve. In aition, sinthe short-term probability of fault is relatively high, the slope in the neterm of the fault stribution function is relatively steep. 题目也没有说是问cumulative啊，我理解撑了marginfault stribution不行么
NO.PZ2016082405000030 wnwarsloping steep slope Upwarsloping steep slope wnwarsloping flslope C The C sprea incate a wnwarsloping sprecurve. Note ththe cumulative stribution of fault is always increasing regaress of the slope of the sprecurve. In aition, sinthe short-term probability of fault is relatively high, the slope in the neterm of the fault stribution function is relatively steep. 不懂这题考的是什么？？求详细解答
wnwarsloping steep slope Upwarsloping steep slope wnwarsloping flslope C The C sprea incate a wnwarsloping sprecurve. Note ththe cumulative stribution of fault is always increasing regaress of the slope of the sprecurve. In aition, sinthe short-term probability of fault is relatively high, the slope in the neterm of the fault stribution function is relatively steep. Sprea来越小不是应该越来越平缓吗？
analyst is stuing the C sprecurve for establishecompany. The 1-, 3- an5-yesprea are 400 bps, 200 bps, an150 bps, respectively. Whiof the following interpretations of the ta is most likely correfor the shape of the fault stribution? fault stribution Near-Term Slope Upwarsloping flslope wnwarsloping steep slope Upwarsloping steep slope wnwarsloping flslope C The C sprea incate a wnwarsloping sprecurve. Note ththe cumulative stribution of fault is always increasing regaress of the slope of the sprecurve. In aition, sinthe short-term probability of fault is relatively high, the slope in the neterm of the fault stribution function is relatively steep. 老师看答案的，还是觉得是b哇，讲义中纵轴就是fault stribution 啊
老师，这个题目为啥是看累计分布？题目也没说啊
