You have to have a direct access broker and level 2 screen you place 100 bid and another trade on the ask depending on which way you think it will go like today we knew up; and when they are filled you make pocket change screws us and they make a little money. We live in a corrupt world full of ignorant people. Scalping is based on an assumption that most stocks will complete the first stage of a movement (a stock will move in the desired direction for a brief time but where it goes from there is uncertain); some of the stocks will cease to advance and others will continue. A scalper intends to take as many small profits as possible, not allowing them to evaporate. Such an approach is the opposite of the "let your profits run" mindset, which attempts to optimize positive trading results by increasing the size of winning trades while letting others reverse. Scalping achieves results by increasing the number of winners and sacrificing the size of the wins. It's not uncommon for a trader of a longer time frame to achieve positive results by winning only half or even less of his or her trades - it's just that the wins are much bigger than the losses. A successful scalper, however, will have a much higher ratio of winning trades versus losing while keeping profits roughly equal or slightly bigger than losses.
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