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黄路迦 · 2024年04月22日

如下

* 问题详情,请 查看题干

NO.PZ201803130100000107

问题如下:

In the risk parity asset allocation approach that Müller uses, the weight that Müller places on domestic bonds should be:

选项:

A.

less than 25%.

B.

equal to 25%.

C.

greater than 25%.

解释:

C is correct.

A risk parity asset allocation is based on the notion that each asset class should contribute equally to the total risk of the portfolio. Bonds have the lowest risk level and must contribute 25% of the portfolio’s total risk, so bonds must be overweighted (greater than 25%). The equal contribution of each asset class is calculated as:

wi* Cov(ri,rp)=1nδρ2

where

wi = weight of asset i

Cov(ri,rp) = covariance of asset i with the portfolio

n = number of assets

σ2= variance of the portfolio

In this example, there are four asset classes, and the variance of the total portfolio is assumed to be 25%; therefore, using a risk parity approach, the allocation to each asset class is expected to contribute (1/4 × 25%) = 6.25% of the total variance. Because bonds have the lowest covariance, they must have a higher relative weight to achieve the same contribution to risk as the other asset classes.

“the expected return of the domestic bond asset class is the lowest of the asset classes”

这句话有什么用没有,好像在公式里不体现啊

2 个答案

Lucky_品职助教 · 2024年11月13日

嗨,爱思考的PZer你好:


同学你好:


因为这道题的题干中,并没有给出具体的 domestic bond volatility是多少,只能从the expected return of the domestic bond asset class is the lowest of the asset classes这句话,来推导出domestic bond是这四类资产中风险最低的。


是的,risk parity有个缺点,它只考虑了风险,没有考虑收益率,所以risk budgeting引入资产收益率,认为当excess return1/MCTR1=excess return2/MCTR2时,资产1和2的风险达到了均衡。这个均衡条件使得投资者在每个资产上承担的风险以及获得的收益达到最优状态,也就是所说的 optimal use of risk 。

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Lucky_品职助教 · 2024年04月23日

嗨,从没放弃的小努力你好:


同学你好。


“the expected return of the domestic bond asset class is the lowest of the asset classes”这句话在公式里没有体现,但是对于解答这道题是至关重要的。这道题是不需要计算的。


风险平价在资产配置里的观念是,每个资产类别对投资组合的总风险的贡献应该相等。在这个例子中,有四个资产类别,如果平均来看,每个资产应该贡献总风险的25%,但是由于domestic bond是这四类资产中风险最低的,并且domestic bond与其他资产的协方差也是最低的,所以如果想要让domestic bond贡献出和其他资产相同的风险,那就需要domestic bond的配置权重必须大于平均的25%,因此它们必须具有较高的相对权重才能实现与其他资产类别相同的风险贡献。



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nilidgnauh · 2024年11月12日

“the expected return of the domestic bond asset class is the lowest of the asset classes”这句话在公式里没有体现,但是对于解答这道题是至关重要的。请问为什么需要用到except return解题?是不是笔误?还有就是是不是狭义那个risk budgeting的时候才要考虑except return?

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