Can someone explain the concept of 'scalping' Now, by scalping, I am talking about earning the spread. (I always thought scalping was just trading using a very small timeframe charts, but im told its all about theroretically becoming a marketmaker and providing liquidity) How does it actually work though? Say the ES is trading at 1288 bid x 1288.25 ask You'd put a limit buy in at the bid and a limit sell in at the ask? correct? So if they both get hit then you have earnt the spread. A Successful scalp. But what if you get filled on your long at the bid and then price just plummets without getting filled on your sell limit order? YOu're screwed, no? Or is there a way of timing the trade using information to have a good possibility of getting hit on both of your orders. When people discuss this concept of 'scalping' 'earning the spread' etc, they make it sound like 'free money'. Am I right in my example above? im a newbie but its just something that i want to at least get my head around, because at the moment, i dont get it. Is this how the big banks make their money?