题目
When the maturity of a plain coupon bond increases, its duration increases:
选项
A.indefinitely and regularly
B.up to a certain level
C.indefinitely and progressively
D.in a way dependent on the bond being priced above or below par
答案
B
解析
Answer: BA coupon bond's duration increases as its maturity increases, but it can never be larger than the number of years to maturity.票息债券的久期随着其到期日的增加而增加，但永远不能超过其到期期限。