College graduates often out-earn those without a college 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. Put another way, college graduates earn 67% more. 

But recently, there has been a renewed emphasis on helping workers without college degrees learn new skills to increase their earnings — without going back to school full-time. One of those efforts is being organized by the Federal Reserve Bank of Philadelphia, which estimates that workers without a bachelor's degree could earn $15,000 more per year through upskilling.