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They dictate the operations of their suppliers. They force large expansions in capital investment and then decide that they don’t want to renew the supplier relationship before the financing for the capital investments can be paid back. The only way suppliers can hope avoid this is to do what Walmart wants or constantly change their products in often superficial ways with branding agreements for IP of entertainment companies.
From Amazon:
In 2023, FBA had been the preferred choice of 82% of Amazon sellers to deliver their products.