Which retail innovation revolutionized religious publishing in the 1970s, making Christian books widely available in mainstream retail settings for the first time?

The intersection of faith and commerce has created unique retail innovations throughout history. Religious bookstores, gift shops, and specialty retailers have developed distinct approaches to brand positioning and customer experience that align with their spiritual values. This trivia question explores a significant retail innovation that transformed how religious products are marketed and sold to believers worldwide.

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The founding of Family Christian Stores chain
The 'spinner rack' program that placed Christian books in secular bookstores
The introduction of the first Bible mobile shopping app
The creation of subscription box services for religious products