fixed; legal theft @6:50 https://www.youtube.com/watch?v=-Eyo0u4_sYI
there are two exchanges, one private for the banks and one for the retail investors. The banks go on the private exchange to buy or sell for your order and then go on your retail exchange and fill your order/sale. They keep the difference and then charge you additional fees for filling the order.
Legallized theft.