College graduates significantly out-earn those without an advanced degree. The Bureau of Labor Statistics estimates that American workers with a bachelor's degree make $1,248 per week on average while workers with just a high school degree earn closer to $746 per week on average. 

But according to a new report conducted by McKinsey and nonprofit Opportunity@Work, as many as 30 million U.S. workers without college diplomas have the skills necessary to earn 70% more. Often, the report claims, employer education requirements hold these workers back.