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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.

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
Welcome to Money.SE! Take a look around, and please glance at our FAQ. – C. Ross Nov 6 '12 at 13:31