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A comment on Vanguard Is Growing Faster Than Everybody Else Combined. Parent comment

Re:Vanguard Is Growing Faster Than Everybody Else Combined by hueving on Wednesday April 19, 2017 @05:11AM (#14146456)
Random walk depends on all participants acting rationally based on the same information released at the same time. However, index funds are not rational, they always buy in the same ratios regardless of news.
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Re:Vanguard Is Growing Faster Than Everybody Else Combined by aangjie on Wednesday April 19, 2017 @05:48AM (#14146591)
I'd suspect all those HFT firms will have robot agents (trading based on some ratios/logic) as simulations for their testing environment.
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