Which product innovation was initially rejected by its inventor's own company with the infamous internal memo stating it had "no market value" before becoming one of the most revolutionary office products?

Throughout history, certain product innovations have completely transformed industries and consumer behavior. These breakthrough inventions often faced initial skepticism but went on to revolutionize how we live and work. This trivia question focuses on a fascinating moment in innovation history that changed an entire industry and created new consumer expectations. Test your knowledge about the development of transformative products that disrupted established markets!

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The Post-it Note (3M)
The Xerox photocopier
The Apple Lisa computer
The Sony Walkman