Which of these innovative retail technologies from the early 2000s was dubbed 'the future of shopping' but became one of the decade's biggest retail tech failures due to privacy concerns and poor consumer adoption?

Some of history's most ingenious inventors created products meant to revolutionize retail that instead became legendary failures. These innovations promised to change how we shop forever but missed the mark in spectacular fashion. Test your knowledge of these fascinating retail missteps that became valuable lessons for future innovators and marketers. Can you identify the groundbreaking retail technology that seemed brilliant on paper but failed dramatically in practice?

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IBM's RFID Smart Cart that automatically scanned and tallied purchases as customers shopped
Amazon's early PrimeAir drone delivery system that failed multiple FAA safety tests
The 'Pay By Touch' biometric payment system that raised $340 million before bankruptcy
Walmart's 'Smart Shelf' technology that tracked inventory but inadvertently revealed customer purchase patterns