Which retail innovation is credited with making the Bible the most widely distributed religious text in history?

Throughout history, religious texts have been marketed, distributed, and made accessible in various innovative ways. The printing and distribution of religious materials represent some of the earliest examples of product marketing and retail innovation. This trivia question explores a significant milestone in the accessibility and commercialization of sacred texts that transformed how people interact with religious literature.

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Gideon International's hotel Bible placement program (est. 1908)
Amazon's Kindle religious text library (est. 2007)
Thomas Nelson's budget-friendly Bible printing initiative (est. 1798)
Vatican's multilingual Bible app launch (est. 2011)