Which innovative pricing strategy was first widely adopted during the Great Depression that fundamentally changed retail psychology?

During the Great Depression (1929-1939), retailers had to radically rethink their pricing strategies to survive. This crisis period sparked several innovations in pricing psychology that we still see today. Test your knowledge of how modern pricing strategies emerged from one of history's most challenging economic periods, and discover how retailers adapted to keep consumers spending when money was incredibly scarce.

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The 99-cent pricing model (pricing items at $0.99 instead of $1.00)
Loss leader pricing (selling select items below cost to drive store traffic)
Subscription-based pricing (paying monthly for regular product delivery)
Dynamic pricing (changing prices based on real-time demand)