Which retail innovation did the Gutenberg Bible introduce that revolutionized how religious texts were sold and distributed in the 15th century?

Throughout history, religious texts have been at the forefront of publishing innovations. The Bible, in particular, has pioneered numerous retail and distribution strategies that shaped modern book selling. This poll explores how sacred text commerce has evolved and the technological innovations that have made spiritual wisdom more accessible to believers worldwide.

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Mass production using movable type printing, making Bibles affordable to middle-class households rather than just churches and nobility
The subscription model, where buyers would pre-order and make payments over time as pages were printed
Illuminated cover displays, creating the first 'premium packaging' strategy for luxury religious items
Door-to-door sales networks through monastic orders, establishing the first direct-to-consumer religious product channel