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Some professional traders do not enter the market by market orders... they use limit orders... they are creating the market... so how are they profiting with that approach? Lets say GBP-USD is at 1.32545 Program will offer to sell GBP at 1.32548... so 0.03 cents higher... ( advantage is in market spreads in your favor ) if someone takes that trade... EA will try to sell it at marker price of 1.32545 making 0.03 cents profit on that transactions. But that may not happen... Price can go down 0