Which revolutionary retail promotion strategy was first widely implemented during the Great Depression to boost sales?

During the economic hardship of the Great Depression (1929-1939), retailers had to innovate or perish. This period saw remarkable developments in marketing strategies, pricing models, and customer experience approaches that would forever change the retail landscape. Some of the world's most enduring retail success stories emerged during this challenging era. Test your knowledge of how product development and marketing adapted during this pivotal historical moment.

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Buy-one-get-one-free (BOGO) offers
Layaway payment plans
Loyalty punch cards
Online flash sales