Which retail innovation first made religious texts widely accessible to the average person in 15th century Europe?

Religious books and sacred texts have a fascinating retail history that spans centuries. From handwritten manuscripts to mass-market publishing, the way spiritual wisdom has been packaged, marketed, and sold has evolved dramatically. This trivia question explores a significant milestone in the retail history of religious texts that transformed accessibility and democratized spiritual knowledge across the globe.

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Gutenberg's printing press allowing mass production of Bibles
Monastic bookshops with subsidized pricing systems
Royal subscription services delivering religious materials monthly
Church-sponsored lending libraries with take-home manuscripts