DATA structure work in "FIFO" stands for first-in, first-out, meaning that the oldest inventory items are recorded as sold first but do not necessarily mean that the exact oldest physical object has been tracked and sold.. I have many times, On the FLY canceled an order. And it's up to the Flat form to fight both ways to fill as fast as possible and cancel as fast. ...I promise you Set price to 0.0002 you get less shares, your order fills instantly !!
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