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Possible Duplicate:
How much do brokerages pay exchanges per trade?
What do brokerage firms do?

How much does it cost a broker to trade a company's stock on your behalf? Is it different for different SEC (Nasdaq and NYSE)? What is the criteria for becoming a broker?

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marked as duplicate by Dilip Sarwate, littleadv, Chris W. Rea Nov 6 '12 at 18:22

This question was marked as an exact duplicate of an existing question.

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One answer to your first question can be found here, and following the link there will likely reveal the answer to the second. The third question is off-topic for this site. – Dilip Sarwate Nov 6 '12 at 3:47
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Welcome to Money.SE! Take a look around, and please glance at our FAQ. – C. Ross Nov 6 '12 at 13:31