This assumption states that one can explain a person’s behavior based on the relationships in which they are involved. Studies have become known that deal with behaviors that are physically harmful, such as smoking or the fact that people suffer from obesity. Something else, which also has to do with well-being, was also investigated by the same two researchers. This is about whether people are happy (Christakis and Fowler 2007, 2008). Apparently, this is also contagious. We ourselves have found that this applies to consumption habits and preferences (Stegbauer and Rausch 2014; Stegbauer 2016, 2024) for certain goods, for example: All of this depends on people’s relationships.