Which innovative marketing strategy did Clarence Saunders introduce in 1916 that revolutionized retail shopping and remains a standard practice today?

Step back in time to explore the fascinating history of retail innovation. Before the digital revolution and even before television advertising, clever entrepreneurs were developing revolutionary marketing strategies that would shape the industry for generations to come. This trivia question examines a groundbreaking retail technique that changed how consumers interacted with products forever. Test your knowledge of retail history!

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Self-service shopping (allowing customers to select their own goods rather than requesting them from clerks)
Mail-order catalogs with color photographs of products
The "loss leader" pricing strategy (selling certain items below cost to attract customers)
Loyalty programs with collectible trading stamps redeemable for merchandise