Requiring specific textbooks in specific editions removes all market forces and direct competition. It also kills the second-hand market and makes it much more difficult for libraries. When students are free to choose which textbooks to buy or rent from a library you get a much healthier market.
I'm shocked at how reasonable a policy this is.
Seems like the only way that’s work is if the teacher provided all necessary info and books were only supplemental.
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.
So, good idea but too much pressure on departments to be bringing in indirect grant funds, and not enough incentive to release it openly. I think some people in some places can get away with it, but not everywhere.
Change college accreditation / federal financial support rules so that the cost of textbooks is rolled up in the university's tuition fee, and standardize tuitions across departments within each university.
Get paid to teach the class, and then also make 100 or more students pay for some photocopies, the money which goes directly into the professors pocket - oh yea, and then change a few paragraphs each year and tell next year's class they can't rely on previous years books - i.e. no resale market for the 'book' you just bought.