NO.PZ2023052301000021
问题如下：
Exceptions to the maturity effect exist for bonds that have:
选项：
A.
long maturities, make small coupon payments, and trade at a discount.
B.
short maturities, have high coupon rates, and trade at a discount.
C.
long maturities, have high coupon rates, and trade at a premium.
解释：
A is correct. Exceptions to the maturity effect are rare and occur only for low-coupon (but not zero-coupon) long-term bonds trading at a discount.
B is incorrect because the maturity effect holds for bonds that have short maturities and high coupons.
C is incorrect because the maturity effect always holds on bonds priced at a premium above par value.
老师在前面别的同学提问的解答中明白了那个图，但是为什么discount发行的债券duration的图会先增加后下降呢
