Which of these revolutionary retail innovations was introduced FIRST, fundamentally changing how goods were sold and distributed?

The retail landscape has transformed dramatically over centuries, with key innovations reshaping how we shop. Throughout history, certain retail innovations have revolutionized the industry and become foundational to modern commerce. This poll tests your knowledge of significant historical retail breakthroughs that continue to influence today's shopping experiences and supply chain management practices. Can you identify which pioneering retail innovation came first and fundamentally changed shopping as we know it?

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Piggly Wiggly's self-service shopping model (1916)
Barcode scanning technology at checkout (1974)
Walmart's computerized distribution system (1969)
Sears Roebuck's mail-order catalog system (1925)