Which retail technology innovation, first implemented in 1916 at the Piggly Wiggly store in Memphis, Tennessee, fundamentally changed shopping by allowing customers to select their own merchandise directly?

The retail landscape has evolved dramatically over centuries, with certain innovations completely transforming how we shop. This trivia question focuses on a pivotal technological development that revolutionized retail in the early 20th century and laid the groundwork for modern shopping experiences. Test your knowledge of retail history and the technological innovations that shaped consumer culture as we know it today!

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The self-service grocery store format (allowing customers to collect their own items instead of requesting them from clerks)
The mechanical cash register with receipt printing capability
The shopping cart (initially called 'folding basket carriers')
The price tag system (with fixed prices replacing haggling)