There’s certainly some validity to this explanation. Yes, those charts and diagrams are expensive to produce, and the relatively small print runs of textbooks keep publishers from enjoying the kind of economies of scale they get on a bestselling popular novel. Any economist who has a pulse (and probably some who don’t) could poke holes in this argument pretty quickly, though.
In the simplest economic terms, the high price of textbooks is symptomatic of misaligned incentives, not exorbitant production costs. Students hold the reasonable stance that they’d like to spend as little money as possible on their books. Students don’t really have the latitude to pick which texts they need, though.
Read the real story behind sky-high textbook prices at mental_floss. Link