Which packaging innovation from the 1950s revolutionized retail by dramatically extending product shelf life and allowing for self-service shopping models?

Throughout history, product packaging has evolved dramatically, influencing consumer behavior and retail strategy. One packaging innovation in particular created a seismic shift in how products were marketed, preserved, and consumed. This innovation fundamentally altered the retail landscape, extended product lifecycles, and transformed consumer purchasing patterns. Test your knowledge of this pivotal moment in retail packaging history!

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Vacuum-sealed tin cans
Cellophane wrapping
Polyethylene plastic packaging
Paperboard cartons with wax coating