Which product innovation most dramatically reduced the cost of Bible production in the 15th century, making it the first mass-market religious product?

The printing and distribution of religious texts represents one of history's most significant product developments. The Bible, in particular, revolutionized retail strategies and created entirely new markets. This poll explores a fascinating aspect of how Bible production transformed product design and retail history in ways that continue to influence modern product strategies across industries.

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Gutenberg's movable type printing press
Parchment manufacturing guilds
Monastic illumination techniques
Wood block printing with watercolor inks