When the Kindle price is higher than the physical book

"...finding that half of these physics textbooks have Kindle editions priced higher than their hardcover counterparts is a word against everything we were promised about the affordability and accessibility of digital books."

Textbook publishers certainly never made this promise! Why textbooks cost as much as they do -- and how colleges get away with mandating buying new editions when virtually nothing changes (in order to deter buying/selling used books) could be a contentious debate by itself...