Which retail design innovation, first introduced in the 1930s, allowed customers to browse and select products themselves rather than requesting items from clerks behind counters?

The retail landscape has been shaped by numerous inventions and design innovations throughout history. Some discoveries completely transformed how consumers interact with products and make purchasing decisions. This poll tests your knowledge about a groundbreaking retail design concept that revolutionized the shopping experience and influenced consumer psychology in ways that continue to impact modern commerce.

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Self-service shopping cart (invented by Sylvan Goldman)
Self-service store layout (pioneered by Clarence Saunders' Piggly Wiggly)
Barcode scanning system (developed by Norman Joseph Woodland)
Electronic point-of-sale terminals (created by IBM)