Which revolutionary pricing strategy was first widely implemented during the Great Depression that fundamentally changed retail history?

During the Great Depression (1929-1939), companies had to radically rethink their pricing strategies to survive in an economy where consumer spending plummeted by over 40%. This crisis sparked innovative approaches to product pricing that fundamentally changed retail history and still influence modern business practices. Test your knowledge about this pivotal era in retail pricing evolution!

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Psychological pricing (prices ending in .99)
Loss leader pricing (selling select items below cost)
Dynamic pricing (prices that change based on demand)
Subscription-based pricing (monthly payments for access)