Which retail innovation, first implemented in the 1920s by a major American retailer, revolutionized supply chains by creating a system where stores automatically reordered products when inventory reached predetermined levels?

Throughout history, retail supply chains have evolved dramatically, transforming how goods move from producers to consumers. From ancient trade routes to digital logistics networks, these systems have shaped economies and societies. This trivia question explores a pivotal innovation in retail supply chain history that fundamentally changed the retail landscape and continues to influence modern commerce.

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Sears Roebuck's mail-order catalog distribution system
A&P's integrated warehouse-to-store delivery network
Piggly Wiggly's self-service shopping model
JCPenney's 'Chain-Store System' with centralized purchasing and automatic stock replenishment