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Multiple sourcing is $.$ a sourcing strategy in which the buying firm depends on a single company for all or nearly all of a particular item or service

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a sourcing strategy in which a company uses a single supplier for one particular part or service and another supplier with the same capabilities for a different part or service, with the understanding that each supplier can act as a backup for the other supplier

a sourcing strategy in which two suppliers are used for the same purchased product or service

$$ a sourcing strategy in which the buying firm shares its business across multiple suppliers