

Depending on what exactly they are, these books may be practically worthless. I recently looked into selling some of my old college textbooks (that were $50-100 each at purchase), and they currently list online for <$5 each. Old editions are of no use to current students, and there’s no demand for previous editions (while there’s a good deal of supply).






It really depends on the subject; mathematics for instance probably isn’t going to change much decade to decade, but psychology is changing constantly.