Which retail innovation in the 15th century was most responsible for dramatically increasing access to the Bible, transforming it from an elite luxury item to a more widely available product?

Throughout history, religious texts have evolved not just as spiritual guides but also as commercial products. From ancient hand-copied scrolls to mass-printed volumes and digital platforms, the 'business' of religious literature has undergone fascinating transformations. This poll explores a pivotal innovation that revolutionized how sacred texts were distributed and consumed, making religious knowledge more accessible to the masses.

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Gutenberg's printing press with movable type
The development of paper manufacturing in Europe
The establishment of monastic scriptoriums
The introduction of leather-bound codex formats