magfrump comments on Fundamentally Flawed, or Fast and Frugal? - Less Wrong
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for any well-defined sense of "tend to do better than" it has to, otherwise it isn't tending to do better.
(since any stock someone has heard of is "tending to do better than" the set of stocks people haven't heard of)
Unless the statement was intended to be "stocks of companies people have heard of tend to do better than stocks of SIMILAR COMPANIES people haven't heard of."