Which retail innovation, first introduced in 1916, revolutionized shopping by allowing customers to select their own products rather than asking clerks behind counters?

Throughout history, retail has undergone dramatic transformations in how products are presented and sold. From ancient marketplaces to today's digital commerce, retail strategies have evolved to meet changing consumer demands. This poll explores a pivotal moment in retail history that revolutionized how people shop and set the foundation for modern retail chains. Test your knowledge about this significant retail innovation that changed consumer behavior forever.

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Self-service grocery stores (Piggly Wiggly)
Department stores with multiple floors (Marshall Field's)
Mail-order catalogs (Sears Roebuck)
Shopping malls with multiple retailers (Country Club Plaza)