Difference Between Poker and the Stock Market

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Assuming markets are priced efficiently, you are always giving up edge when investing in the market to market makers. That is, the more you trade, the less you are expected to win. I like to think of commissions as rake and the edge lost to market makers as negative Sklansky dollars. In poker you still pay the rake, but profitable players instead are the recipients of Sklansky dollars.

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Nothing stops you from being a market maker yourself.