Which retail innovation was first introduced by Clarence Saunders in 1916, revolutionizing how customers interacted with products?

Long before online shopping carts and digital payments, retail was undergoing dramatic transformations that shaped how we shop today. This trivia question explores a pivotal innovation in retail history that fundamentally changed customer experience and set the stage for modern shopping. Test your knowledge of retail's evolutionary milestones and see if you can identify which groundbreaking concept truly revolutionized the industry in its early days.

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Self-service shopping (Piggly Wiggly stores)
Loyalty punch cards (Blue Stamp Trading System)
Department store credit cards (Filene's of Boston)
Standardized price tags (F.W. Woolworth)