EconBuff Podcast #23 with Ryan Mattson Dr. Ryan Mattson talks with me about the GameStop short squeeze episode. Dr. Mattson walks us through the four potential narratives surrounding RobinHood's decision to shut down trading. We discuss the mechanical explanation, where RobinHood, is forced to stop trading for reasons related to clearinghouse and collateral constraints. We explore the trading curb narrative, and Dr. Mattson explains how the stock exchange often halts trading