Which revolutionary retail product development in the 1450s most dramatically increased access to the Bible for ordinary people?

In the realm of religious publishing, technological advances have transformed how sacred texts are produced and distributed. From ancient hand-copied manuscripts to mass-produced modern editions, the business of religious texts represents one of the oldest and most influential sectors of publishing. This poll explores a pivotal moment in religious product development that changed how people access spiritual wisdom.

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Gutenberg's printing press with movable type
The development of paper manufacturing in Europe
Introduction of leather-bound personal prayer books
The establishment of monastic scriptoria networks