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七七 · 2024年07月14日

two portfolio法中,basic要求overfunded,variants不要求overfunded

NO.PZ2022122801000041

问题如下:

PZ is the sponsor of a $1.25 billion legacy DB plan, which is now frozen. The funded ratio is 0.8. The plan sponsor, receives three asset allocation approaches recommendations:

a surplus optimization approach.

an integrated asset–liability approach.

a hedging/return-seeking portfolios approach.

When evaluate asset allocation choices, consider the plan sponsor’s costs.

Determine which asset allocation approach would be most appropriate for the pension fund. Justify your response.

选项:

解释:

Surplus optimization approach is the most appropriate.

Surplus optimization does not require an overfunded status, while implementation of the basic two-portfolio approach depends on having an overfunded plan.

Integrating the liability portfolio with the asset portfolio, is the most comprehensive of the three approaches, but increased complexity.

two portfolio法中,basic要求overfunded,variants不要求overfunded。题目中没有明确是用basic,那为什么通过fund ratio=0.8这个条件,把two portfolio法排除了呢

2 个答案

Lucky_品职助教 · 2024年07月23日

嗨,努力学习的PZer你好:


因为这道题的考点,不是让你对比basic hedge/return seeking 和它的变形模式啊!这道题就是在考察,surplus optimization,hedging/return-seeking,以及integrated asset–liability这三种方式的特征对你,为什么要强行把variants纳入到你的考量当中呢?我们答题,还是要根据题干中给出的明确信息,以及题目的问题来进行回答。


根据你的问题,我进一步说一下。


Hedging/Return-seeking 的方法,只有是最基础的模式时,必须要求是positive funded ratio,但是它还有两种变形,Partial hedge 和 Dynamic versions,并不要求positive funded ratio。也就是说,在如果想更加激进,或者打破这个局限,就引入了这两个变种策略.

这两个变种的策略,因为涉及Partial hedge,所以主要针对更加激进的Portfolio,所以这个策略对Underfunded会更好用一些,因为Underfunded时,这种策略可以加大Expected return,有机会补充缺口。这样即使没有surplus,基金经理也可以采用这些方法来更激进的投资,达到fully funded的目的。

但是这些variants 和 basic hedge/return seeking的方式,并不能混为一谈,在逻辑上它们的区别还是很大的。

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七七 · 2024年08月12日

我想表达的是,题目给的a hedging/return-seeking portfolios approach,没有特别说明是basic,那variants是不是也要考虑呢。如果考虑的话,确实也是没要求ooverfunded的,所以不能依靠 The funded ratio is 0.8来排除。 我的逻辑是hedging/return-seeking portfolios approach下包括3个方法,basic、Partial hedge 和 Dynamic versions。

Lucky_品职助教 · 2024年07月15日

嗨,努力学习的PZer你好:


同学你好:


这里需要将hedge/return seeking和Surplus optimization做一个区分,总的来说Surplus optimization中是将A-L得到的surplus看做一个整体,本质上是对组合的surplus进行最优化求解,求的是surplus的效用最大化。如果underfunded,surplus为负,这个方法的目的就是缩小负值。

 

而hedge/return seeking则是将一块蛋糕切成两块,变成hedging portfolio(A=L)和return-seeking portfolio(A>L),hedging部分用于cover liability,return-seeking部分追求收益。overfunded是hedge/return seeking的必要条件,同时也是这个方法的缺点。


这道题 的funded ratio是 0.8,也就是underfunded的状态,只能使用Surplus optimization的方法。

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七七 · 2024年07月23日

老师没有回答我的问题。variants hedge/return seeking法不要求overfunded,为什么根据unded ratio是 0.8也就是underfunded的状态,只能把basic hedge/return seeking排除,无法排除variants hedge/return seeking法

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