NO.PZ2023090801000011
问题如下:
For a bond with a modified duration of 4 and a convexity of 0.25, which of the following changes in credit spread would result in a price decrease closest to 7.5%?
选项:
A.
1% decrease
B.
1% increase
C.
2% increase
解释:
%∆PVFull = −(AnnModDur × ∆Spread) + 0.5×AnnConvexity × (∆Spread)^2
− (4 × 0.02) + 0.5 × 25 × (0.02)^2 = –0.075 or –7.5%
The spread change is inversely related to the price effect, with a spread increase leading to a fall in bond price. Note that since duration was 4, we had to rescale the convexity from 0.25 to 25.
这题怎么按计算机?有没有快一点的方法