Which retail innovation was first introduced by Clarence Saunders in 1916 at his Piggly Wiggly store, revolutionizing how consumers shop?

Retail innovation often has fascinating stories behind it. Some of the most common shopping experiences we take for granted today were once revolutionary breakthroughs that fundamentally changed how consumers interact with products and brands. This trivia question explores a significant retail innovation that transformed the shopping experience and consumer behavior worldwide.

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Self-checkout lanes
Shopping carts
Self-service shopping (customers selecting their own items)
Loyalty card programs