In this article, the average earnings resulting from different levels of education are compared. As you can see, those holding professional degrees have the greatest income while those who did not finish high school have the lowest. The article goes on to point out that the level of education attained isn’t always the best indicator of income, though. Rather, it is what was studied. Therefore, using education levels to compare incomes can only tell you so much – after all, what those degrees are in may end up giving you better information. Nonetheless, general data such as this is telling, and clearly shows that more education tends to lead to higher earnings.
Source: Economix Blog