How does Kroger (and other large grocery chains) make all of its generic brand food?

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Kroger has a generic branded version of pretty much everything in their store. How do they make all of it? There are different recipes, molds, and entirely different production processes for most of this stuff. Do they buy each product off of someone else and put on their own packaging, or do they really make it all themselves? (And if so, where are all these factories?)

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