> By law, you cannot buy or sell stock on someone else's behalf unless you check with all major US stock exchanges first to verify that you are getting your cl

> By law, you cannot buy or sell stock on someone else's behalf unless you check with all major US stock exchanges first to verify that you are getting your client the best price. The side-effects of this law and because of it not being able to achieve a 'fair' price was why IEX was created. Edit: This is neither a pro nor anti comment. It is a factual comment, of the motivation to create IEX.