Buffering的时候可能会导致真正持有的股票数量和Index中股票的数量不一致的原因

NO.PZ2023010903000014

问题如下：

For the large-cap US equity portion of Sapphire’s investment portfolio, Cullen believes that there are some existing passive indexed-based funds that track the S&P 500 Index that the foundation should consider. Cullen presents Exhibit 2 to Sapphire’s board.

Exhibit 2 S&P 500 Index Funds

as an indexing technique, the number of holdings in Manager B’s index least likely illustrates:

选项：

reconstituting

packeting

buffering

解释：

Reconstitution involves deleting names that are no longer in the index and adding names that have been approved as new index members. Therefore the holdings of the fund should always be 500.

当Index剔除一只Stock时，Portfolio会先考察一段时间后再卖出，所以成分股种类的数量会【大于】Index；当index加入一只Stock时，Portfolio会先考察一段时间后再买入，所以成分股种类的数量会【小于】Index

我这样理解对吗？

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