Which retail innovation, introduced in the 1930s, revolutionized consumer behavior by allowing customers to select their own products rather than asking clerks behind counters?

The retail landscape has transformed dramatically throughout history. Before modern e-commerce and digital marketing, retail pioneers created innovative approaches to branding, customer experience, and promotion that set the foundation for today's retail strategies. This trivia question explores a pivotal moment in retail history that changed how products were presented and sold to consumers.

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Self-service shopping (the supermarket model)
Mail-order catalogs with color photography
Retail loyalty card programs
Department store escalators