In this episode, Riko and Ryota talked about irrationality, social norms and market norms, and logical fallacies. Human beings tend to compare, they use social norms and market norms in different purposes, and they will obey themselves if there are some praises for them. Human beings sometimes use these how to think or behavior by mistake, which may cause some serios problems. However, there are some solutions to solve the problems and we will indicate them. We hope you enjoy this final episode of Season 2.