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pepperhyp · 2023年08月27日

大数定律不是可以用来预测负债嘛?只是因为题目说了model,没说forecast?

NO.PZ2022122801000004

问题如下:

Fox is in the process of hiring an asset allocation analyst and has just completed interviewing two candidates, Ambrose Kelly and Catherine Trainor, for the position. Fox reminded the candidates that in addition to high-net-worth individuals, the firm’s client base also includes various institutional investors. The candidates made the following statements:

Ÿ Trainor: A goals-based approach to asset allocation is appropriate for individual investors, but institutions need to focus either on the asset or liability side of the balance sheet, depending on the nature of their business.

Ÿ Kelly: A typical objective of some institutions is to maximize their Sharpe ratio for an acceptable level of volatility, and they rely on the law of large numbers to assist them in modeling their liabilities. Other institutions behave much like individuals by segmenting general account assets into sub-portfolios associated with specific lines of business with their individual return objectives.

The most appropriate statement in regards to approaches to asset allocation by institutions is made by:

选项:

A.

Kelly, regarding their goals-based allocations.

B.

Trainor.

C.

Kelly, regarding the Sharpe ratio and modeling of liabilities.

解释:

如题。

1 个答案

lynn_品职助教 · 2023年08月28日

嗨,努力学习的PZer你好:


大数定律不是可以用来预测负债嘛?只是因为题目说了model,没说forecast?


Kelly 提到的机构的目标分配方法是正确的。例如,保险公司会将其总账资产分成与特定业务线或负债块相关的子组合,每个子组合都有自己的回报目标。这种方法可以更好地管理风险和优化回报,确保每个子组合的需求得到有针对性和高效的满足。


A typical objective of some institutions is to maximize their Sharpe ratio for an acceptable level of volatility, and they rely on the law of large numbers to assist them in modeling their liabilities. 


大数定律通常用于描述大样本数量下的随机现象,而不是用于建模负债。建模负债通常涉及使用财务模型和风险管理方法,而不是依赖于大数定律。

并且我们也不太用最大化夏普比率,MVO中也是最大化utility,这里也不是最佳选项。


Trainor: A goals-based approach to asset allocation is appropriate for individual investors, but institutions need to focus either on the asset or liability side of the balance sheet, depending on the nature of their business.


机构投资者资产配置有AO和ALM两种方法,AO方法只看资产端,ALM要专注于资产和负债两端,两端要匹配,


所以T同学说机构投资者focus on the asset side of the balance sheet倒是没问题的,错在 either on the asset or liability side of the balance sheet,正确的表述应该是focus on the relation of asset and liability。


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