After settling into his dorm this past fall, John McGrath, a freshman at Rutgers University, took the campus shuttle to the school bookstore. He waited in line for 40 minutes clutching a list of four classes—including Microeconomics, Introduction to Calculus, and Expository Writing—and walked out later with an armful of books, some bundled with digital codes that he would use to access assignments on the publishers’ websites. He also exited the store with a bill for about $450.

McGrath, an accounting major, pays close attention to his expenditures. He had researched all the textbook options—new, used, digital, loose-leaf, rental—and knew about the various online venues that compete with campus bookstores for sales. His plan was to buy materials that he could later resell. But he was surprised to learn not only that he had to purchase digital codes for half of his classes, but also that those codes are often sold exclusively at the campus bookstore—and for a steep price.

“There doesn’t seem to be any way around it, you have to pay to do homework”

Publishers and some professors tout the advantages of these new digital assessment tools, pointing to their ability to streamline the academic experience by making it more efficient and customized. The fact that they’re becoming omnipresent on some campuses speaks to instructors’ enthusiasm for them. The access codes threaten to exacerbate the already-high cost of college materials, undermining the used-book market and reshaping the college experience.

Read more about the extra costs of college by Laura McKenna at The Atlantic