What makes college tuition more expensive? Americans' flatlining incomes.

A new chart made by our friends at FindTheBest shows not only has college tuition grown significantly faster than inflation, health care costs or the price of food, but higher education has gotten much more expensive due to a stagnant median income in the United States.

Using their historical tuition database, which was sourced from the National Center for Education Statistics, FindTheBest compared tuition growth with income data from the U.S. Census Bureau.

All dollar amounts are inflation-adjusted and the tuition data is strictly based on four-year public colleges and universities.