According to recent retail analytics, which demographic factor has shown the strongest correlation with increased spending on physical religious books rather than digital versions?

Religious bookstores and specialty shops face unique challenges in today's digital marketplace. While faith-based products maintain steady demand, understanding consumer behavior and market trends is essential for these specialized retailers. This trivia question explores an interesting aspect of religious consumer demographics that affects product placement, marketing strategies, and inventory decisions in stores catering to spiritual and philosophical needs.

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Age (consumers over 55)
Education level (advanced degree holders)
Geographic location (rural vs. urban)
Household income (upper middle class)