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

Step back in time to explore a pivotal moment in retail history that transformed how we shop forever. This question examines an innovation that fundamentally changed the customer experience and retail strategy, laying the groundwork for modern commerce as we know it today. Test your knowledge of retail history and see if you can identify this revolutionary retail concept that broke with centuries of tradition.

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Self-service grocery stores (Piggly Wiggly)
Department stores with multiple sections (Marshall Field's)
Mail-order catalogs (Sears Roebuck)
Checkout counters with cash registers (Woolworth's)