Комментарии пользователя Alex
MadQuant, The S&P 500 index is a free-float weighted/capitalization-weighted index
The Shanghai Stock Exchange Index is calculated using a market capitalization-weighted formula. The market capitalization of each stock is multiplied by its free-float factor, which represents the proportion of shares that are available for public trading.
Tokyo Price Index (or TOPIX), which is a capitalization-weighted index that includes all the stocks in the Tokyo Stock Exchange.
А как еще считать? Это же простейшая схема используемая всеми. Хорошая компания — много капитализации, значит заслуживает большой доли в индексе.