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If by "or something" you mean payment by a willing buyer somewhere else, sure.

Do you know what comparative advantage means?

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well why are they gonna grow "extra" in case the US needs it. most of the time the US won't and the gamble won't pay off, and the extra production will drive prices down, that's what Imean.

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They grow "extra" because they believe someone somewhere else will buy it. It doesn't have to be the US. You think Japan produces all their food domestically?