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how do brokers make money from margin accounts?
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they will make money from brokerage as usual and also from the interest they charge you for lending you the money for you to buy your shares on margin. in other words you will be paying interest on the $30,000 you borrowed from your broker. also, as per chris's comment, if you are shorting securities through your margin account, your broker would charge you a fee for lending you the securities to short.
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