Which retail innovation, introduced in the early 20th century, revolutionized shopping by allowing customers to select their own merchandise without clerk assistance for the first time?

The retail landscape we know today evolved through fascinating historical innovations. This trivia question explores a pivotal moment in retail history that fundamentally changed how consumers interact with products and transformed the shopping experience forever. Test your knowledge of retail history and the visionaries who shaped modern commerce!

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Self-service grocery stores (pioneered by Piggly Wiggly in 1916)
Department stores with multiple product categories (pioneered by Bon Marché in 1852)
Mail-order catalogs with home delivery (pioneered by Montgomery Ward in 1872)
Chain store standardization (pioneered by A&P in the 1880s)