Which retail innovation from the 1930s dramatically changed consumer psychology by introducing the concept of 'impulse buying' and is credited with increasing unplanned purchases by an estimated 50%?

Throughout history, retail has undergone remarkable transformations that shaped how we shop today. From ancient marketplaces to modern e-commerce, certain innovations stand out as revolutionary milestones. This trivia question explores a pivotal moment in retail history that fundamentally changed consumer psychology and shopping patterns. Test your knowledge of how historical retail innovations have influenced modern commerce!

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Shopping carts (invented by Sylvan Goldman in 1937)
Self-service grocery stores (pioneered by Piggly Wiggly in 1916)
Department store escalators (first installed at Harrods in 1898)
Charge cards (introduced by Diners Club in 1950)