Which retail innovation did Clarence Saunders introduce in 1916 that revolutionized grocery shopping and remains the standard model for most supermarkets today?

Before modern retail giants dominated the landscape, innovative pioneers shaped how we shop. This trivia question explores a pivotal moment in retail history that transformed consumer culture and established practices we take for granted today. Test your knowledge of the fundamental shifts that created our modern shopping experience!

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Self-service shopping (Piggly Wiggly stores, where customers selected their own items instead of requesting them from clerks)
The shopping cart (initially called 'folding basket carriers' to help customers carry more items)
Checkout lanes with conveyor belts (allowing for faster processing of multiple customers)
Printed price tags (eliminating haggling by standardizing prices for all customers)