Which retail innovation from the 1950s revolutionized customer retention by introducing the concept of 'points' that could be collected and redeemed for products?

The history of retail has been marked by transformative innovations that changed how consumers shop and how businesses operate. From ancient marketplaces to modern e-commerce, retail evolution reflects broader economic and technological trends. This trivia question focuses on a pivotal moment in retail history that fundamentally altered consumer behavior and marketplace dynamics. Test your knowledge about how retail strategies have evolved through time!

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S&H Green Stamps, which retailers distributed based on purchase amounts and customers collected in booklets to exchange for merchandise
Diners Club charge cards, which created the first universal payment system for multiple retailers
Sears Catalog 'Reward Dollars' program, which gave percentage-based kickbacks on mail order purchases
A&P Supermarket 'Plaid Stamps', which offered exclusive discounts on future purchases at affiliated stores