"A natural question to ask about these findings is what drives this dramatic divergence in the outcomes between the most educated Americans and everybody else. According to one theory, Americans who go to college acquire skills that allow them to excel in a range of professions; the rewards of a degree might reflect their greater ability to contribute to public life and our collective prosperity. According to another theory, important traits such as the capacity to avoid self-destructive behaviors have a strong bearing both on whether somebody gains a college degree and on whether they’re able to live a healthy and successful life. In this case, the difference between these two groups might be mostly “compositional” in nature, simply reflecting the fact that different kinds of people are likely to end up in each group. Case and Deaton, who prefer describing trends to explaining their causes, caution that scholars have yet to come up with a definitive answer to this question. But they mistrust explanations that rationalize the chasm between Americans with and Americans without a college degree as an accurate reflection of each group’s respective choices or skill sets. “We have increasingly come to believe,” they conclude in their new paper, that a college degree “works through often arbitrary assignation of status, so that jobs are allocated, not by matching necessary or useful skills, but by the use of the BA as screen.” In an email to me, Deaton was more blunt: Both he and Case believe that the college degree is most important as “a route to social standing.”"