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求教教材习题Security Market Indices关于rebalancing的问题

"20        Which of the following index weighting methods requires the most frequent rebalancing?
A        Price weighting. B        Equal weighting. C        Market-capitalization weighting."
(Institute 111)
Institute, CFA. CFA Institute Level I 2014 Volume 5 Equity and Fixed Income. John Wiley & Sons P&T, 2013-07-12. VitalBook file.

书上的正确答案是B。我的问题是,如果是equal weighting,那么每个constituent equity所占比例不都一直是weight = 1/N (N = number of securities)?就算价格变化,貌似也不会影响到weight呀?

答案是这样解释的:"Changing market prices will cause weights that were initially equal to become unequal, thus requiring rebalancing." 但还是不明白。。。

求指教!多谢!

equal weighting 是指对组合中的每只股票要持有相同的市值,一旦市值不等就要再平衡。
举例:如果组合中有四只股票,总资金是10000元,则对每只股票的投资金额都是1/4*10000=2500元。假设四只股票初始价格分别是5,10,25,50元,则初始投资持有的股票数量分别是500,250,100,50股。当一股票价格从5元变成8元,则该股票的持有市值会变成8*500=4000,而其他三个股票的市值还是各2500,在这时,由于价格变化导致持有股票的市值已经不相等了,所以需要进行再平衡。

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立刻就懂了,解释得好清晰,谢谢!!

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