Which pricing strategy led to the Guinness World Record for 'Largest Single-Day Retail Sales Event' with over $38 billion in sales in 24 hours?

The world of retail has seen some remarkable pricing strategies that have led to world record-breaking sales and customer engagement. Beyond simple discounts and promotions, some retailers have implemented revolutionary pricing approaches that have earned them a place in the record books. This trivia question explores one such extraordinary pricing innovation that created retail history and changed how we think about value perception in stores.

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Alibaba's Singles' Day dynamic pricing algorithm that adjusts prices based on real-time demand
Amazon's Prime Day subscription-based tiered pricing model with early access rewards
Walmart's 'Price Match Guarantee' combined with flash sale lightning deals
Target's 'Circle' loyalty program with personalized pricing and point multiplier days