Which retailer holds the Guinness World Record for the 'Largest Discount Shopping Event' based on gross merchandise value, setting a pricing strategy benchmark?

The world of retail is full of remarkable achievements that have made their way into the record books. From jaw-dropping discounts to pricing strategies that broke all expectations, retailers have found creative ways to earn their place in retail history. This trivia question focuses on a spectacular pricing strategy that earned a place in the Guinness World Records. Test your knowledge about this extraordinary retail achievement!

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Alibaba Group (Single's Day)
Amazon (Prime Day)
Walmart (Black Friday)
Flipkart (Big Billion Days)