Which innovative marketing strategy led to the record-breaking sales of the 'Living Wisdom' multi-faith scripture collection in 2018?

In the competitive religious publishing industry, marketing strategies can make or break a product launch. In 2018, one religious publisher implemented an innovative approach that transformed how sacred texts are marketed in the digital age. This campaign not only increased sales by 300% but also created unprecedented engagement across multiple faith communities. Test your knowledge about this groundbreaking marketing strategy that changed religious publishing.

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AR-enhanced pages that displayed additional commentary when scanned with a smartphone app
Celebrity endorsements from prominent religious leaders across different faiths
Limited edition covers made from materials mentioned in the respective sacred texts
Subscription model that delivered one sacred text per month with expert analysis