There is a lot that goes into this. Things like which crops are subsidized, what additives are used, transport cost, shelf life, product buy backs, and a lot of others factors. For example, fresh vegetables are harder to transport than canned vegetables, because they go bad easier. The supplier is usually liable for any product that goes bad, so to protect their profit they use climate controlled trailers to transport them, so the transport cost is already higher than for canned vegetables.
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