Which pricing strategy was used by Amazon during its 2019 Prime Day event that broke the world record for the most products sold in a 48-hour period?

Retailers are constantly breaking records with innovative pricing approaches that capture global attention. Some pricing strategies have literally made it into the Guinness World Records! Test your knowledge about the intersection of world records and retail pricing strategies that have shaped consumer behavior and made history in the marketplace.

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Lightning Deals with Dynamic Pricing - where prices automatically adjusted every 10 minutes based on demand
Reverse Auction Pricing - where prices decreased by 1% every hour until products sold out
BOGO Extreme - buy one product, get five products free on select electronics
Subscription-Only Pricing - exclusive deals available only to 5+ year Prime members