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Wednesday, March 07, 2012 6:27:22 PM
"Level III
This is a trading service consisting of everything in Level II plus the ability to enter quotes, execute orders and send information. This service is restricted to NASD member firms that function as registered market makers. Level III allows you to enter bid/ask quotes as the trades are being executed right in front of you. It is the fastest way to execute a trade and is typically found only on the trading floors of brokerage firms and market makers.
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http://www.investopedia.com/university/electronictrading/trading7.asp#axzz1oTbUhlCd
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