College textbook edition churn forces students to repurchase nearly identical content every 2-3 years

Publishers release new editions of introductory textbooks (e.g., Calculus, Biology 101) every 2-3 years with minimal content changes — often just rearranged problem sets, updated cover art, and renumbered chapters — rendering the previous edition unusable because professors assign edition-specific homework problem numbers. So what? Students cannot buy cheaper used copies of the prior edition because the problem numbers no longer match the syllabus. So what? A student taking 5 courses per semester spends $500-$1,200 on textbooks annually, with STEM and pre-med students at the high end. So what? Low-income students skip buying the textbook entirely, falling behind on assigned readings and homework, which directly lowers their grades. So what? Lower grades reduce eligibility for merit-based scholarships and competitive program admissions, compounding the financial disadvantage. So what? This creates a measurable GPA gap correlated with income rather than ability, undermining the meritocratic premise of higher education. It persists structurally because publishers and universities have an entangled incentive: publishers generate revenue from new editions, and professors receive free desk copies, ancillary materials, and test banks tied to the latest edition, so they have no personal cost incentive to resist the upgrade cycle. Additionally, campus bookstore contracts and inclusive access programs lock students into publisher pricing with opt-out barriers.