Medical Ecology says that the Man is in midest of environment. The question directs us that the social & occupational environment are affected on our decisions and actions.
There is a 75 years old research, the longest in history, done by Harvard Medical School and summarized by his actual director, Robert Waldinger. In fact, it´s the combination of two longitudinal studies started in 1938, the Grant Study and the Glueck Study. There are two books written on the findings and a quite interested TED video by Waldinger about the findings. You can transpose results.