Which retail innovation was FIRST widely implemented in military exchanges (PX/BX) before becoming standard in civilian retail?

Military exchanges (PX/BX stores) have a fascinating history in retail innovation. These tax-free department stores exclusively serve military personnel and their families worldwide, generating billions in revenue annually. Beyond just shopping, they play a crucial role in maintaining morale and providing a taste of home for deployed troops. Test your knowledge about this unique retail ecosystem that bridges military service and consumer commerce.

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Self-checkout kiosks
Barcode scanning system
Fixed pricing (no haggling)
Loyalty card programs