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

The history of retail has been shaped by revolutionary innovations that transformed how we shop. From ancient marketplaces to modern digital commerce, retail innovations have reflected changing societies and technologies. This trivia question explores a pivotal moment in retail history that forever changed the customer experience and set the foundation for modern shopping as we know it today.

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Self-service grocery stores (Piggly Wiggly)
Department stores with fixed pricing (Bon Marché)
Mail-order catalogs (Montgomery Ward)
Shopping malls with multiple vendors (Country Club Plaza)