在20世纪90年代末，投资者们无论大小都想在网络概念股中插一手。
In the late 1990s, investors big and small wanted a piece of the dot.com action.
引入指数的概念是为了使投资人对整体市场有大概的认识，依据市值权重的指数在这方面表现非常良好。
Indices were created so investors could have a sense of how the overall market is performing, and market value-weighted indices do this very well.
这些概念已经被价值投资者使用了超过50年。
The concepts have been used by value investors for over 50 years.
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