Which retail innovation was successfully launched during the Great Depression (1929-1939) and revolutionized the grocery shopping experience?

The 1930s Great Depression fundamentally changed how companies marketed and sold products. While many businesses collapsed, others innovated with new retail strategies that have shaped modern commerce. This period saw the birth of some counterintuitive marketing approaches and retail innovations that helped certain brands not only survive but thrive during economic catastrophe. Test your knowledge about one of the most influential product strategy shifts from this challenging historical period.

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Self-service shopping carts (introduced by Sylvan Goldman for Humpty Dumpty supermarkets in 1937)
Barcode scanning systems (developed by IBM for inventory management)
Refrigerated display cases (pioneered by General Electric for grocery stores)
Automated checkout registers (invented by NCR to reduce labor costs)