NO.PZ2018062010000014
问题如下：
If the market discount rates for all three bonds increase by 50 basis points, which bond will experience the smallest decrease in the percentage of price?
选项：
A. Bond A
B. Bond B
C. Bond C
解释：
B is correct.
Bond A and bond B has the same time to maturity, but B has a higher coupon rate. So the duration of bond A is higher than that of bond B.
Bond A and bond C has the same coupon rate, but C has a longer time to maturity. So the duration of bond A is lower than that of bond C.
C's duration > A's duration > B's duration, bond B will experience the smallest decrease in the percentage of price.
比方说，我先对比期限，把期限最长的c选项排除，对比a和b，原则coupon小的那个，为什么不对呀