问题如下：
When the market discount rate of Bond X and Bond Y change in the same amount. Compared to Bond X, the percentage price change of Bond Y will be:
选项：
A.lower
B.equal
C.greater
解释：
A is correct.
According to maturity effect, because Bond X has a longer maturity time, Bond X will have a greater percentage price change; and Bond Y will have a lower percentage price change.
老师这道题可以从coupon effect角度考虑吗
