Let's assume that institutions or traders at institutions are dumb. Being dumb, they don't know how to trade. If they do trade publicly on an exchange, they lose money. In this zero sum game of trading, some money goes to retail traders. To avoid losing money to retail traders, institutions decide to trade directly with themselves. In such a way, they bypass the exchanges where retail traders are waiting to pounce on them. So in the interest of retail traders and, more importantly, for the sake of market transparency, let's abolish dark pools. My challenge to institutional traders: If you know how to trade, come to the exchanges where the playing field is level and transparency is assured by a third party like Better Business Bureau (no more GS trick of front running/flash trading/co-location of servers bs), don't hide in your dark pools, come out into the open.