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Admiral Adama's comment on 买股票可靠运气?/史慧娴. All Comments
Admiral Adama
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典型的德州神枪手谬误，先开枪然后才画靶。你试下叫你家的猫来选10-20只马股来看看。。。

美股保持牛市几十年了。所以就算你随机选10-20只美股分散投资，你的投资回报都会和s&p500产生high positive correlation. 但你的投资回报比s&p高，可能只代表你随机选出来的是high beta portfolio而已，并不代表你的随机组合有positive alpha.

牛市里，不但每个人都是股神，连你家的宠物都是。。。
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