Which retail sales technique has been shown to most effectively increase Bible sales in bookstores?

In the competitive religious publishing market, various sales and marketing techniques have evolved to promote sacred texts and philosophical works. This poll explores an interesting fact about Bible sales and consumer behavior that highlights the intersection of commerce and faith. Test your knowledge about the business side of religious literature!

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Positioning Bibles in dedicated 'Faith Sections' rather than general book areas
Allowing customers to personalize covers and add name engravings
Offering bundled discounts with complementary devotional materials
Using digital kiosks for comparing different translations and versions