很不幸，普通投资者对此束手无策。
Unfortunately, there is little for the average investor to do about any of this.
指数首先是为普通投资者纵观市场提供一种指导。
They were devised to give the general investor a guide to the overall mood of the market.
普通投资者的回报等于市场回报率减去成本；如果成本上升，受益必会下降。
The return to the average investor is the market return minus costs; if costs rise, returns must fall.
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