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

christy931

"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！

christy931

立刻就懂了，解释得好清晰，谢谢！！