6% in 2014 according to this.. https://thecrite.com/home/2014/04/29/the-hidden-cost-of-education-textbook-inflation-poses-financial-burden-for-students/ https:

6% in 2014 according to this.. https://thecrite.com/home/2014/04/29/the-hidden-cost-of-education-textbook-inflation-poses-financial-burden-for-students/ https://thecrite.com/home/2014/04/29/the-hidden-cost-of-educ... But even if it's low, it's also low hanging fruit for a big problem.