Which retail innovation, first introduced in 1916, fundamentally changed shopping by allowing customers to select their own merchandise without clerk assistance?

The history of retail is filled with innovative breakthroughs that transformed how we shop. From humble market stalls to global empires, retail innovation has shaped economies and cultures. This poll tests your knowledge about a pivotal moment in retail history that forever changed the shopping experience and laid the foundation for modern retail concepts we take for granted today.

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Self-service grocery stores (Piggly Wiggly)
Department store catalogs (Sears Roebuck)
Retail membership clubs (Costco predecessor)
Shopping malls with multiple retailers