Source: Bureau of Labor Statistics, Current Population Survey.
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Juding from the table, we can see that people of high degree got much more salaly than the less than high school diploma. Meantime, the less than high school diploma also has high unemployment rate than the high diploma people. but the professional degree got more salay than the doctoral degree. Why? In my opintion, one person got professional degree are improtant, bacause the company like proferments and professional than high degree.