I am not prop...i am buy side institutional. there is a prop firm business model that i dont understand. in the prop shops that GIVE you capital (not retail...but you are using firm moeny to trade) i understand that they want lots of volume to generate comissions. however, if it is the FIRMS money that you are trading..then the comissions coming back to the firm is just the same money they loaned out to trade. so how are they generating more money out of that? how do prop firms make money on comissions on the traders that are trading firm capital (assuming they are net zero or negative)???