Which retail innovation from the 1930s radically transformed the customer experience by introducing the concept of 'self-service' shopping, allowing customers to select their own products without clerk assistance?

The retail landscape has evolved dramatically throughout history, transforming how customers interact with brands. From the earliest market stalls to today's omnichannel experiences, retail customer experience has been shaped by technological innovations, changing consumer expectations, and competitive pressures. This trivia question explores a pivotal moment in retail history that fundamentally changed the customer journey and set the stage for modern retail experiences.

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The supermarket (first pioneered by King Kullen in 1930)
The department store credit card (introduced by Wanamaker's in 1938)
The shopping mall (first indoor mall was the Country Club Plaza in 1924)
The cash register with receipt printing (NCR's electric model from 1933)