Walter is about to leave, but Saul takes some time to advise against it. While it may seem like he’s doing what’s best for his family, Saul explains how law enforcement will come after Skyler and ruin Walter’s family. Walter is making a private decision about what to do and what he believes is best, but he may be ignoring all of the costs he imposes on other people by running. Saul suggests that if he truly cares about his family then he’ll turn himself in.
See more: externalities, interdependent utility functions, negative externalities, private benefits, private costs, social costs
The Economics of Breaking Bad 