After Bow (Tracee Ellis Ross) tried to explain basic finances to Diane (Marsai Martin), Bow finds Diane has sold the Beyonce doll she just bought -- a doll Bow thought was a frivolous purchase. Diane explains the whole thing was basic arbitrage: She's flipped it for 10 times what she paid for it, and she used that money to invest in property in North Carolina. The teacher has definitely become the student here. From 'black-ish' season 7, episode 16, 'Jack's First Stand.' Watch 'black-ish' TUESDAY 9|8c on ABC, streaming, on demand, and Hulu.