A large-scale study conducted at the University of Georgia discovered that students who received free course materials at the beginning of a class received much higher academic results than those who did not. The study drew a comparison between the final grades of students enrolled in eight major undergraduate courses between 2010 and 2016. Each course was taught by a professor who, at a point during the six-year study period, changed from using a commercial textbook that was valued at more than $100 to a digital, free textbook, otherwise known as an open educational resource (OER). When the results (before and after) were compared, it was concluded that changing to OER increased the quantity of A and A- results by 5.5% and 7.73%, respectively.
https://www.thetechedvocate.org/the-impact-of-oer-at-the-university/
