Could be, but acquiring business from a customer like Apple can also work to one’s favor. The volume required with an Apple supply contract should allow a manufacturer to drive down production costs, allowing for more profitable business with other customers.I can imagine losing such low margin business might actually be a good thing for a supplier.
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That said, companies often pass on business they don’t think they’ll be able to make any money on, or because they’d rather not deal with a difficult customer.