Which retail self-service innovation, now standard in e-commerce, was first widely implemented in military PX (Post Exchange) stores during WWII due to personnel shortages?

The retail landscape we know today was significantly shaped by innovations born from military needs. From supply chain logistics to consumer psychology tactics, many standard retail practices emerged from wartime necessity. This trivia question explores how a specific WWII-era military retail strategy revolutionized consumer shopping behavior and continues to influence e-commerce trends today. Test your knowledge of this fascinating intersection of military history and retail innovation!

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Shopping carts with standardized layouts
Membership-based purchasing programs
Mail-order catalogs with color photographs
Point-of-sale discount promotions