Which retail marketing innovation, first implemented in the 1910s, revolutionized shopping by allowing customers to select their own merchandise without clerk assistance?

In the long history of retail, certain innovations fundamentally transformed how consumers interact with products. From ancient marketplaces to modern shopping experiences, technological advancements have continuously reshaped the retail landscape. This poll explores a pivotal moment in retail history that revolutionized marketing strategies and consumer behavior. Test your knowledge about this game-changing retail innovation that set the foundation for modern shopping experiences.

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Self-service grocery stores (pioneered by Piggly Wiggly)
Department store catalogs (pioneered by Sears Roebuck)
Shopping malls (pioneered by Country Club Plaza)
Discount chain stores (pioneered by Woolworth's)