NO.PZ2018122701000076
问题如下：
In the past few years, the markets have experienced very low interest rates, in some rare cases below zero. A risk manager is selecting an interest rate model which should reflect the following properties:
- Negative values should revert to a mean rate.
- The tree should be recombining to make computation feasible.
- The rates should be able to move between positive and negative values.
After researching various models, which of the following is most appropriate?
选项：
A.Black-Karasinski model.
B.Vasicek model.
C.Ho-Lee model.
D.Constant drift model.
解释：
B is correct.
考点Term Structure Models
解析：根据第一点提到的均值回归，就可以判断使用的是Vasicek model.
第一个是什么模型，讲义哪里有提到过呢
