Watched it a bit at random but it's an hilarious, compact sneak peek at modern stock exchanges and how they're rigged, in a way.
Perfect information Edit : I mean it's not news that computers factor heavily in stock trading, it's the case since the late eighties at least... But it's insane how razor thin the margins are. And fairly telling that an actual trader was pretty oblivious to all of it for a long time in his career before diving into it.