Which mythological concept did luxury retailer Neiman Marcus use as inspiration for their innovative 'Circle of Legends' customer retention program that increased repeat purchases by 28%?

In today's competitive retail landscape, many brands leverage mythology and folklore to create memorable customer experiences and drive retention. From Norse gods appearing in subscription boxes to Greek legends inspiring limited-edition collections, ancient stories continue to captivate modern consumers. This trivia question explores how one major retailer used mythology to revolutionize their customer loyalty program with remarkable results.

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Valhalla's eternal reward system (Norse mythology)
The Elysian Fields' tiered access model (Greek mythology)
The Phoenix renewal cycle (Egyptian mythology)
The Jade Emperor's celestial hierarchy (Chinese mythology)