Which innovative retail strategy was first widely adopted during the Great Depression as a response to economic hardship?

The Great Depression (1929-1939) was one of history's most challenging economic periods, yet it sparked remarkable retail innovations that continue to influence modern business practices. During this era of financial hardship, retailers had to develop creative strategies to survive and attract cash-strapped consumers. This poll tests your knowledge about a revolutionary retail concept born from economic necessity that transformed shopping patterns forever.

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Supermarkets with self-service shopping
Subscription-based retail memberships
Buy-one-get-one-free promotions
Online catalog ordering