Is there a strategy involving multiple brokers (at least 2) where the trader benefits from the difference in quoted price and or spread from the different brokers? I thought I heard of such a one (possible in forex), but I just can't grasp how this is possible. Also, if I recall, it seemed to involve the term "scalping" due to the relatively fast turnaround. For example, if broker1 has bid/ask as 1.2345/48 and broker2 has bid/ask as 1.2349/52 on the same instrument; is there a strategy to profit relatively quickly (perhaps even if there is no price movement)? I don't see how because if you open a position with broker1, you still have to close it. You can't say, buy at broker1's price and sell at broker2's price and profit; one must still close out each position -- or is there such a method that does start with a similar approach?