That was what the star was for. Look at the end of my comment for the link. That's one of many that I could have chosen.

Your link says, "a college degree correlates [...] to [...] salary". It is well-known that education level correlates to income. A claim that weak does not need a reference. Correlation is not causation. My question was: "Does having a college degree increase earning power/potential?" Do you know of any education/income studies that control for IQ?