Amazon is *very* proud of its #flywheel: at first, the company offered subsidies to customers, which lured in sellers. Then, it demanded that those sellers lower their prices, which lured in more customers. With more customers, more sellers piled in. Faster and faster, the flywheel spins, creating the #EverythingStore:
https://fourweekmba.com/amazon-flywheel/
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Amazon Flywheel: Amazon Virtuous Cycle In A Nutshell - FourWeekMBA
The Amazon Flywheel or Amazon Virtuous Cycle is a strategy that leverages on customer experience to drive traffic to the platform and third-party sellers. That improves the selections of goods, and Amazon further improves its cost structure so it can decrease prices which spins the flywheel.