问题如下：
Hirji also proposes the following duration-neutral trades for the French institutional client:
Long/short trade on 1-year and 3-year Canadian government bonds
Short/long trade on 10-year and long-term Canadian government bonds
Which yield curve forecast will most likely result in the highest profit for Hirji’s proposed duration-neutral trades?
选项：
A. Increase in curvature
B. Decrease in curvature
C. Parallel downward shift
解释：
A is correct.
The trades are also called a condor and employ four positions, much like a butterfly with an elongated body. Each pair of duration-neutral trades would result in a profit if the yield curve adds curvature. The trades at the short end of the curve (going long the 1-year bond and short the 3-year bond) would profit if that end of the curve gets steeper. In addition, the trades at the long end of the curve (going short the 10-year bond and long the long-term bond) would profit if that end of the curve becomes flatter.
这道题 long/short trade 1年和3年债券，就是long 1年 short3年的意思？
