Which retail innovation, first widely implemented in the 1450s, revolutionized access to religious texts and is credited with helping spread the Protestant Reformation?

Throughout history, religious institutions and philosophical movements have pioneered unique retail innovations to spread their messages and sustain their communities. From ancient temple marketplaces to modern online spiritual stores, the business of faith has evolved dramatically. This trivia question explores a fascinating retail innovation that changed how spiritual texts and materials were distributed to the masses.

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Gutenberg's printing press and mass-produced Bibles
Monastery scriptoria subscription services
Church-sponsored lending libraries
Door-to-door Bible salesmen networks