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小脖溜想要蓝霸霸 · 2023年12月03日

C为什么错了

NO.PZ2022120702000077

问题如下:

Caroline runs a portfolio, which screens out securities with low ESG scores from the benchmark index. She then reweights the portfolio with the remaining securities according to their market capitalisations. To address tracking error, she runs a portfolio optimisation programme.Has the tracking error issue been resolved?

选项:

A.No, she should apply a strong ESG tilt to the portfolio. B.Yes, but the portfolio is now overweight securities that correlate with omitted securities. C.Yes, the removal of a small portion of securities from the benchmark will not impact relative performance in the long run. D.Yes, this strategy generally outperforms its benchmark when the excluded securities underperform.

解释:

Caroline管理的投资组合是从基准指数中剔除ESG得分较低的证券之后,根据剩余证券的市值重新调整权重构建的,这样她管理的投资组合和基准指数就会有较大的跟踪误差。她想通过最优化的方式解决这个问题,例如设定一个最小化tracking error的限制。但是这样会给予与被剔除证券相似的证券更高的权重,例如股票A被剔除,股票B与A相似,最优化后会给予B更高的权重。

C为什么错了

1 个答案

净净_品职助教 · 2023年12月04日

嗨,从没放弃的小努力你好:


选项C的说法是:"是的,从基准指数中剔除一小部分证券不会长期影响相对表现。" 这个选项假设剔除低ESG评分证券的数量不大,因此对跟踪误差的影响有限。然而,这个假设可能不成立,原因如下:

  1. 剔除证券的影响:即使只剔除了一小部分证券,这些证券的特性(如行业、规模或波动性)可能与其它证券存在显著差异。这种差异可能导致剔除后的投资组合与基准指数之间的系统性偏差,从而影响跟踪误差。
  2. 市值加权的影响:Caroline根据剩余证券的市值重新加权投资组合。这种方法虽然有助于保持与基准指数类似的市值分布,但不能保证投资组合的行业和风险特性与基准指数完全一致。
  3. 长期表现的不确定性:长期来看,剔除的证券可能会有不同的表现趋势,这可能会影响投资组合相对于基准指数的表现。如果这些低ESG评分的证券表现出色,那么投资组合可能会长期跑输基准指数。
  4. 优化程序的局限性:尽管Caroline运用了投资组合优化程序来处理跟踪误差问题,这种方法主要是基于历史数据和统计模型,但未来市场的表现可能与历史不同,因此无法保证完全解决跟踪误差问题。

因此,选项C假设了剔除证券数量小且长期对投资组合表现影响有限,这在实践中可能并不总是成立,尤其是当剔除的证券具有显著的市场影响或表现出不同的风险/回报特性时。选项B更加准确地指出了剔除某些证券并重新加权可能导致的特定风险,即投资组合可能过度集中在与被剔除证券相关联的其他证券上。

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