Which retail innovation was first introduced by Clarence Saunders in 1916, revolutionizing how customers interacted with products and establishing the foundation for modern supermarkets?

The retail landscape has transformed dramatically throughout history. From ancient marketplaces to modern shopping experiences, retail innovations have shaped how societies exchange goods and services. This poll tests your knowledge about a pivotal historical development in retail that revolutionized consumer behavior and set the foundation for modern supply chain practices. Can you identify the correct historical retail innovation among these options?

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Self-service shopping (Piggly Wiggly stores where customers could select their own merchandise)
Mail-order catalogs with home delivery (allowing rural customers to purchase goods remotely)
Department store credit cards (enabling installment purchasing for expensive items)
Barcode scanning systems (automating inventory tracking and checkout procedures)