Which retail innovation, introduced in the early 20th century, revolutionized shopping habits by allowing customers to select products themselves rather than requesting items from clerks behind counters?

Before the digital transformation we're experiencing today, retail underwent several revolutionary changes throughout history. This trivia focuses on a pivotal moment in retail history that fundamentally changed shopping habits and launched the modern consumer culture we know today. Test your knowledge about how retail strategies evolved through time and shaped our current shopping landscape!

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Self-service grocery stores (pioneered by Piggly Wiggly in 1916)
Department stores with multiple specialized sections (like Macy's in the 1870s)
Mail-order catalogs (popularized by Montgomery Ward in the 1880s)
Installment payment plans (widely adopted in the 1920s)