Which retail innovation did Amazon first patent in 2009 and later implement as 'Just Walk Out' technology, revolutionizing the checkout experience?

In the competitive world of retail, innovation is often the key to survival. Throughout history, certain retail innovations have dramatically changed how consumers shop and how businesses operate. This trivia question focuses on a pivotal retail innovation that transformed the industry and consumer behavior. Test your knowledge about significant retail breakthroughs that have shaped modern commerce!

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Computer vision-based checkout-free shopping
Voice-activated shopping assistants
Drone delivery systems
Dynamic pricing algorithms