You mention that the net value of a bachelor degree is positive. I'm writing this on my phone so I don't have access to any numbers but I wonder what the spread

You mention that the net value of a bachelor degree is positive. I'm writing this on my phone so I don't have access to any numbers but I wonder what the spread (statistical dispersion) is. More specifically, it would be interesting to know whether a large proportion of graduates enjoy some net positive gains due to their degree or only a small minority enjoys out of proportion gains while the rest is losing somewhat.