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

Before online shopping and big box stores dominated retail, a revolutionary concept changed how consumers shopped forever. This poll tests your knowledge about a pivotal innovation in retail history that transformed the consumer experience and created the foundation for modern shopping habits. Do you know which retail format first empowered customers to select their own merchandise without clerk assistance?

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Self-service grocery store (Piggly Wiggly)
Department store (Macy's)
Mail-order catalog (Sears Roebuck)
Discount store (Woolworth's)