Which pricing strategy has become increasingly common for higher-level mathematics textbooks in the past decade?

Higher education mathematics textbooks are known for their unique pricing strategies. Publishers must balance development costs, academic value, and market demand. This trivia question explores how publishers have adapted their pricing approaches in recent years as digital learning platforms have disrupted traditional textbook models. Test your knowledge about this specialized segment of educational publishing where pricing decisions impact both academic institutions and student finances.

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Two-tier pricing: lower cost for digital access codes with higher prices for physical books plus digital bundles
Decreasing prices with each new edition to compete with used book markets
Flat-rate subscription model where students pay monthly for access to all mathematics texts from a publisher
Dynamic pricing based on a student's declared major, with STEM students paying premium rates