Which pricing innovation in religious text distribution is credited with helping fuel the Protestant Reformation in the 16th century?

Throughout history, religious texts have not only been spiritual guides but also fascinating case studies in product distribution, pricing strategies, and accessibility. From ancient hand-copied manuscripts available only to the wealthy elite to mass-produced translations accessible to all, the story of religious texts reveals how pricing and distribution strategies have shaped religious practice and theological development across civilizations.

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Johannes Gutenberg's development of movable type printing, which dramatically reduced Bible production costs
The Vatican's policy of offering indulgences with premium-priced illuminated manuscripts
Islamic waqf endowments subsidizing Quran copying to achieve zero-cost distribution
Buddhist monasteries implementing subscription models for sutra access and interpretation