Which retail innovation, first implemented in 1916 by Piggly Wiggly founder Clarence Saunders, revolutionized shopping analytics by allowing merchants to track customer preferences and product movement?

The evolution of retail has shaped economies and societies throughout history. From ancient marketplaces to digital storefronts, retail innovations have transformed how we consume and interact with products. This trivia question explores a pivotal moment in retail history that fundamentally changed the shopping experience and created new analytics possibilities for merchants. Test your knowledge about this significant retail innovation!

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Self-service shopping (where customers could select their own merchandise rather than asking clerks)
The introduction of store loyalty cards with customer purchase tracking
The first department store with multiple product categories under one roof
Printed mail-order catalogs with customer ordering codes