When the GameStop and Robinhood story exploded at the end of January, suddenly everyone took an interest in market structure and things like payment for order flow, as well as the role that high-frequency trading shops play in enabling free retail trading. This, of course, gave rise to lots of conspiracy theories about ways retail traders are taken advantage of. On the new Odd Lots, we speak with Doug Cifu, the CEO of Virtu, which is one of the largest HFT shops in the country, to get his perspective on how this part of the market really works.