Which innovative pricing strategy did James Stewart use when launching his calculus textbook that helped it become one of the best-selling mathematics textbooks of all time?

In the specialized world of mathematical textbook publishing, pricing strategies are crucial for market penetration and academic adoption. One particular calculus textbook revolutionized the market through an innovative launch strategy that became a case study in educational publishing. Test your knowledge about this famous product launch that changed how mathematical resources are priced and distributed to students and institutions.

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Two-tier pricing: lower cost for students, premium version for libraries
Customizable modular pricing allowing professors to select only needed chapters
Free digital access with purchase of physical book
Subscription-based pricing with annual updates