Which retail innovation, introduced in the 1930s, fundamentally changed product marketing by allowing customers to personally select items rather than requesting them from clerks behind counters?

The evolution of retail has transformed dramatically over centuries, with innovations that changed how people shop and how merchants sell. This poll tests your knowledge about a significant historical retail innovation that revolutionized product marketing and customer experience. Understanding these pivotal moments helps modern product managers and marketers connect today's retail innovations to historical precedents that shaped consumer expectations.

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Self-service shopping (where customers could browse and select products themselves)
Product catalogs with mail-order options
Window displays with featured merchandise
Department stores with multiple product categories