Which retail product innovation from the 1930s dramatically changed shopping habits by allowing consumers to purchase larger quantities of perishable goods at once?

Before modern supermarkets and department stores transformed how we shop, retail pioneers had to introduce revolutionary product innovations that forever changed consumer culture. This poll tests your knowledge of a significant historical product innovation that fundamentally altered retail patterns and consumer behavior in the early 20th century. Do you know which transformative invention truly democratized shopping and created the foundation for modern retail as we know it today?

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The home refrigerator with freezer compartment
Self-service shopping carts
Barcoded product labeling
Automated cash registers