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dmbao

12/05/11 1:07 PM

#111422 RE: weasel6667 #111421

That's market making. Since they are not obligated to fill you they fill a seller at .027 and are now long which they turn around and sell to you .028. Both customers got their orders filled and the MM made some cash. That is how they make money. So it's within the rules for them to do this.