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Betty · 2024年03月19日

B选项的说法有在哪里出现过吗?

NO.PZ2018110601000019

问题如下:

Which of the following statement regarding risk budgeting is most appropriate?

选项:

A.

An optimal risk budgeting is to minimize the total risk.

B.

Risk budgeting is on top-level rather than allocates the risk to a portfolio’s constituent parts.

C.

An asset allocation is optimal when the ratio of excess return to marginal contribution to risk is the same for all assets.

解释:

C is correct.

考点:risk budgeting

解析:risk budgeting的目标是最大化每承担一单位风险所获得的收益,而不是最小化风险,A错。risk budgeting的过程是识别所有风险并且分配风险,B错。C是risk budgeting的结论,当每个资产类型的excess return/MCTR都相同时,资产配置是最优的。

  • B选项的说法有在哪里出现过吗?
  • 然后,optimal risk parity是ACTR all equal,然后optimal risk budgeting是Sharpe ratio(excess return/MCTR) all equal对吧?
1 个答案
已采纳答案

lynn_品职助教 · 2024年03月19日

嗨,努力学习的PZer你好:



  • B选项的说法有在哪里出现过吗?
  • 然后,optimal risk parity是ACTR all equal,然后optimal risk budgeting是Sharpe ratio(excess return/MCTR) all equal对吧?


1、这个知识点是理解risk budgeting的定义。


基础班讲义中risk budgeting定义:The risk budget identifies the total amount of risk and allocates the risk to a portfolio’s constituent parts。所以说,risk budget 是top-level的,并且它的过程就是识别所有分别并且分配风险。错在“rather than”。


B选项纠正一下应该是Risk budgeting is on top-level and allocates the risk to a portfolio’s constituent parts.


2、对的。


risk parity的目标是使得每个资产对总风险的贡献度相同,表达式ACTR1=ACTR2。因为它认为贡献度相等时,资产分散化的效果越好。


但是risk parity有个缺点,只考虑了风险,没有考虑收益率,


所以risk budgeting引入资产收益率,


risk budget的条件是excess return of i /MCTRi=excess return of j/MCTRj,此时,portfolio达到最优状态。


我们从字面意义上就能了解到risk budgeting风险预算,是要把portfolio能承受的总风险在不同资产之间分配,


达到每种资产的风险相等(ACTRi=ACTRj)这种广义risk budget(risk parity)


以及excess return/MCTRi=excess return/MCTRj这种狭义的risk budget状态。


至于同学提到的Sharpe ratio,并不是均衡条件,可以理解成延申的一个性质吧


上述的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


MVO理论最优组合是risk free asset与global risky asset的连接线与无差异曲线的切点,切点sharp ratio最大。


也就是achieve optimal sharpe ratio了。



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