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They raised the price of his goods so that they could sell their own product for cheaper.

They did bought the goods from him beforehand. And he agreed to sell. He should have considered the possibility that Amazon has option to later sell the items as a higher price. Isn't that obvious to any seller?

Amazon does not buy and keep a stock, they charge you for the privilege of selling in their marketplace:

> Sellers then bore the risk of having their products not sell in a timely manner, or at all, while still paying Amazon for things like storage fees of their enrolled products

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