Which retail innovation most dramatically increased accessibility to religious texts in the late 20th century?

Religious texts are some of the oldest and most continuously published products in human history. Throughout centuries, their production, distribution, and marketing have evolved dramatically. This trivia question explores a significant innovation in religious text retail that transformed accessibility and changed how people interact with sacred writings in modern times.

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Audio Bible subscription services
Bible apps with free digital versions of multiple translations
Print-on-demand personalized religious texts
Specialized religious bookstore chains in shopping malls