Which famous marketing strategy was first developed during the Great Depression to help a struggling company survive by offering consumers more value?

During the economic hardship of the 1930s Great Depression, companies had to radically rethink their marketing approaches to appeal to cash-strapped consumers. This era saw the birth of several innovative marketing strategies and consumer products that not only survived the economic downturn but became iconic American brands. Test your knowledge about how product marketing adapted during one of history's most challenging economic periods.

This is a live public trivia poll on AIPolls.Net. Vote and see real-time results.

The soap opera (radio dramas sponsored by Procter & Gamble's soap products)
The money-back guarantee (pioneered by Kodak for camera purchases)
The free product sample (introduced by Coca-Cola at soda fountains)
The customer loyalty program (created by S&H Green Stamps)