The challenge with looking at the statistics for an ROI is that lifetime earnings will vary by field of study, highest degree attained, and location. I am not familiar with US statistics agencies, but Stats Canada has looked at lifetime earnings by field of study. It is a little out of date as this is from 2010 [1], but it shows there are some large differences in earnings by field. In some cases a bachelor's degree results in lower earnings than a high school graduate. [2] shows that depending on major about 30% of graduates go on for further study. That further study may be a lower credential (e.g., certificate or diploma) or a higher credential (e.g., masters or professional degree). [3] shows an analysis of differences in earnings by field, gender, and highest degree level; with the largest increases in earnings coming for those from business, social sciences, and arts. Unfortunately [2] and [3] do not seem to be looking at lifetime earnings.
For men, [1] shows the median lifetime earnings for high school graduates is $882,300. The median lifetime earnings for men with a bachelor's degree is 1,517,200. The lowest field is Fine and Applied Arts at $843,900, which is lower than the median lifetime earnings for those with a high school education, up to the highest median field of engineering with earnings of $1,845,000.
For women, [1] shows median high school lifetime earnings of $458,900, median bachelor's earnings for all fields of $972,500, and lowest median bachelor's earnings of $652,100 (Fine and Applied Arts), and a highest of $1,169,100 (Business Administration). The interesting thing to note is for women there is only 1 of 18 field degree combinations (earnings are provided for bachelor's and associate's) where the woman's lifetime earnings decreases relative to a high school education alone (Fine and Applied Arts associates median earnings are $437,300). For men, 4 of 18 field degree combinations will result in lower lifetime earnings relative to high school education alone.
There is further analysis in [1] of the earnings percentiles by each field showing that men with a business degree earn the most at the 90 percentile. This holds for women with a business degree.
I don't see if this has been restricted to those whose highest education is a bachelor's degree or not, but there is also work that has shown increases in earnings by field for graduate or professional degrees [3]. It's possible that those earnings premiums have been captured in the reporting of [1], but [3] seems to come to the conclusion that most business, arts, and social sciences fields gain a large increase in salary for graduate or professional degrees.
Hopefully those familiar with similar analysis from the US could help to provide that information.
For men, [1] shows the median lifetime earnings for high school graduates is $882,300. The median lifetime earnings for men with a bachelor's degree is 1,517,200. The lowest field is Fine and Applied Arts at $843,900, which is lower than the median lifetime earnings for those with a high school education, up to the highest median field of engineering with earnings of $1,845,000.
For women, [1] shows median high school lifetime earnings of $458,900, median bachelor's earnings for all fields of $972,500, and lowest median bachelor's earnings of $652,100 (Fine and Applied Arts), and a highest of $1,169,100 (Business Administration). The interesting thing to note is for women there is only 1 of 18 field degree combinations (earnings are provided for bachelor's and associate's) where the woman's lifetime earnings decreases relative to a high school education alone (Fine and Applied Arts associates median earnings are $437,300). For men, 4 of 18 field degree combinations will result in lower lifetime earnings relative to high school education alone.
There is further analysis in [1] of the earnings percentiles by each field showing that men with a business degree earn the most at the 90 percentile. This holds for women with a business degree.
I don't see if this has been restricted to those whose highest education is a bachelor's degree or not, but there is also work that has shown increases in earnings by field for graduate or professional degrees [3]. It's possible that those earnings premiums have been captured in the reporting of [1], but [3] seems to come to the conclusion that most business, arts, and social sciences fields gain a large increase in salary for graduate or professional degrees.
Hopefully those familiar with similar analysis from the US could help to provide that information.
[1] https://www150.statcan.gc.ca/n1/pub/11-626-x/11-626-x2014040...
[2] https://www150.statcan.gc.ca/n1/daily-quotidien/150911/dq150...
[3] https://www150.statcan.gc.ca/n1/pub/75-006-x/2018001/article...