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LizLiu · 2020年02月25日

问一道题:NO.PZ201812020100000804

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问题如下:

The yield curve expectation that Abram’s supervisor targets with Scenario 1 is most likely a:

选项:

A.

flattening yield curve.

B.

reduction in yield curve curvature.

C.

100 bps parallel shift downward of the yield curve.

解释:

A is correct.

Scenario 1 is an extreme barbell and is typically used when the yield curve flattens. In this case, the 30-year bond has larger price gains because of its longer duration and higher convexity relative to other maturities. If the yield curve flattens through rising short-term interest rates, portfolio losses are limited by the lower price sensitivity to the change in yields at the short end of the curve while the benchmark’s middle securities will perform poorly

C的话,是因为Duration不变,所以卖不卖中间的债券,没区别吗?如果是C这个情景,应该是什么策略啊?

1 个答案

发亮_品职助教 · 2020年02月26日

嗨,努力学习的PZer你好:


“C的话,是因为Duration不变,所以卖不卖中间的债券,没区别吗?”


对的。

Scenario 1的关键是说,策略前后保证了组合的Duration没变。

如果能预测到收益率曲线是向下平移的,那我们应该增加组合的Duration才是,虽然这道题说Portfolio只允许偏离Benchmark 正负0.3,但是能预测到利率平行下移时,最优的策略就是尽可能增加组合的Duration,而不是从调整组合的结构出发。

如果是调整组合的结构,那基本上这个策略应对的是收益率曲线的非平行移动。平行移动直接调整组合的Duration即可。


注意, Scenario 1是卖掉组合内所有的中期债券,买入2、30-year的债券,所以策略改变之后,他是把一个Laddered portfolio改成了一个Barbell的Portfolio;

在收益率曲线平行移动时,Barbell因为有更大的Convexity,所以也能享受到一定的涨多跌少的优势,但是Convexity带来的收益远远比不上Duration带来的收益,所以如果能预测到曲线的平行移动,优先考虑改变Duration。如果组合有严格的Duration限制,我们才考虑调整Convexity。



“如果是C这个情景,应该是什么策略啊?”


如果组合的Duration没有限制,我们最优的策略就是增加组合的Duration,比方说把短期债券都卖掉,买入30-year的债券;组合的Duration越大,我们的收益就越多。

如果说组合的Duration有限制,题目说了组合的Duration要Match benchmark、且不允许浮动,那我们就只能退而求其次,通过改变组合的Convexity,来获取Convexity涨多跌少的收益,比方说把中期债券都卖掉,只买入短期、长期债券,这样调整之后,组合的Duration没变、但是他的Convexity会变大,享受利率变动时涨多跌少的好处。


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