According to efficient markets research a "buy and hold" strategy coupled with the random selection of securities from the entire market's portfolio will, in most cases, yield returns at least as good as those returns earned by professional traders who rapidly turn over their portfolios.

Question

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Efficient Market Hypothesis (EMH) suggests that all known information is already reflected in stock prices, and thus, it is impossible to consistently achieve higher returns through stock selection or market timing. Therefore, a "buy and hold" strategy with a randomly selected portfolio should, on average, perform as well as strategies employed by professional traders who frequently trade, as they cannot systematically exploit market inefficiencies to achieve higher returns.

According to Efficient Markets Research a "Buy and Hold" Strategy