If the Efficient Markets Hypothesis (in its stronger forms) is false, there should be managers who are able to identify the cheapest stocks within the S&P 500 and thereby outperform the index. A disbeliever in EMH should look to identify these managers and pay them some fee, rather than simply investing in the index and trying to minimize fees.
I think it's plausible that these managers exist, but they're impossible to identify ex ante. Furthermore, a smart manager will charge fees that are equal to the alpha they generate. So even if the EMH is false in some broad sense, individual investors should act as if it were true and simply invest in low-cost diversified funds.
I think it's plausible that these managers exist, but they're impossible to identify ex ante. Furthermore, a smart manager will charge fees that are equal to the alpha they generate. So even if the EMH is false in some broad sense, individual investors should act as if it were true and simply invest in low-cost diversified funds.