With so many people working at home, bored, and with no sports to bet on, there’s been an incredible explosion of retail stock market trading. One service, Robinhood, in particular has gotten a lot of attention due to its free trading, and videogame-like appeal to young users. But how are they really making money on those free trades, and how does the economics of the business work these days? On this episode, we speak with Larry Tabb, the Head of Market Structure Research at Bloomberg Intelligence, who explains how it all works.