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

The history of retail has transformed how we shop and consume products. From local general stores to massive retail empires, the evolution of shopping has reflected broader economic and social changes throughout history. This trivia question explores a pivotal moment in retail history that fundamentally changed consumer culture and established a shopping model we still recognize today.

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Self-service grocery stores (Piggly Wiggly)
Department stores (Macy's model)
Mail-order catalogs (Sears, Roebuck & Co.)
Five and dime stores (Woolworth's)