Which retail innovation, first introduced in 1916, revolutionized shopping by allowing customers to select products themselves rather than requesting items from clerks?

The history of retail has been marked by numerous technological and strategic innovations that transformed how people shop. From ancient marketplaces to modern omnichannel experiences, each era introduced concepts that shaped consumer behavior and business practices. This poll explores a pivotal moment in retail history that fundamentally changed customer shopping patterns and laid the groundwork for modern retail concepts we take for granted today.

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Self-service grocery stores (Piggly Wiggly)
Department stores with multiple product categories
Mail-order catalogs with home delivery
Membership warehouse clubs